Add configuration item of container.network (#184)

Close https://gitea.com/gitea/act_runner/issues/177
Related https://gitea.com/gitea/act/pulls/56

### ⚠️ Breaking
The `container.network_mode` is a deprecated configuration item. It may be removed after Gitea 1.20 released.
Previously, if the value of `container.network_mode` is `bridge`, it means that `act_runner` will create a new network for job.But `bridge` is easily confused with the bridge network created by Docker by default.
We recommand that using `container.network` to specify the network to which containers created by `act_runner` connect.

###  🆕 container.network
The configuration file of `act_runner` add a new item of `contianer.network`.
In `config.example.yaml`:
```yaml
container:
  # Specifies the network to which the container will connect.
  # Could be host, bridge or the name of a custom network.
  # If it's empty, act_runner will create a network automatically.
  network: ""
```

As the comment in the example above says, the purpose of the `container.network` is specifying the network to which containers created by `act_runner` will connect.

`container.network` accepts the following valid values:
- `host`: All of containers (including job containers and service contianers) created by `act_runner` will be connected to the network named `host` which is created automatically by Docker. Containers will share the host’s network stack and all interfaces from the host will be available to these containers.
- `bridge`: It is similar to `host`. All of containers created by `act_runner` will be connected to the network named `bridge` which is created automatically by Docker. All containers connected to the `bridge` (Perhaps there are containers that are not created by `act_runner`) are allowed to communicate with each other, while providing isolation from containers which are not connected to that `bridge` network.
- `<custom_network>`: Please make sure that the `<custom_network>` network already exists firstly (`act_runner` does not detect whether the specified network exists currently. If not exists yet, will return error in the stage of `docker create`). All of containers created by `act_runner` will be connected to `<custom_network>`. After the job is executed, containers are removed and automatically disconnected from the `<custom_network>`.
- empty: `act_runner` will create a new network for each job container and their service containers (if defined in workflow). So each job container and their service containers share a network environment, but are isolated from others container and the Docker host. Of course, these networks created by `act_runner` will be removed at last.

### Others
- If you do not have special needs, we highly recommend that setting `container.network` to empty string (and do not use `container.network_mode` any more). Because the containers created by `act_runner` will connect to the networks that are created by itself. This point will provide better isolation.
- If you set `contianer.network` to empty string or `<custom_network>`, we can be access to service containers by `<service-id>:<port>` in the steps of job. Because we added an alias to the service container when connecting to the network.

Co-authored-by: Jason Song <i@wolfogre.com>
Reviewed-on: https://gitea.com/gitea/act_runner/pulls/184
Reviewed-by: Jason Song <i@wolfogre.com>
Co-authored-by: sillyguodong <gedong_1994@163.com>
Co-committed-by: sillyguodong <gedong_1994@163.com>

go.mod

@@ -87,4 +87,4 @@ require (
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 )
 
-replace github.com/nektos/act => gitea.com/gitea/act v0.245.1
+replace github.com/nektos/act => gitea.com/gitea/act v0.245.2-0.20230516060355-9283cfc9b166

go.sum

@@ -2,8 +2,8 @@ code.gitea.io/actions-proto-go v0.2.1 h1:ToMN/8thz2q10TuCq8dL2d8mI+/pWpJcHCvG+TE
 code.gitea.io/actions-proto-go v0.2.1/go.mod h1:00ys5QDo1iHN1tHNvvddAcy2W/g+425hQya1cCSvq9A=
 code.gitea.io/gitea-vet v0.2.3-0.20230113022436-2b1561217fa5 h1:daBEK2GQeqGikJESctP5Cu1i33z5ztAD4kyQWiw185M=
 code.gitea.io/gitea-vet v0.2.3-0.20230113022436-2b1561217fa5/go.mod h1:zcNbT/aJEmivCAhfmkHOlT645KNOf9W2KnkLgFjGGfE=
-gitea.com/gitea/act v0.245.1 h1:mibEHQzIn+2ehaxj3yC3AAFgegiEpC9MP1ZjjI6e3D8=
-gitea.com/gitea/act v0.245.1/go.mod h1:1ffiGQZAZCLuk9QEBDdbRuQj1GL4uAQk6GNNtcEnPmI=
+gitea.com/gitea/act v0.245.2-0.20230516060355-9283cfc9b166 h1:hvyzFmxDmdSZBd8S2+r8VqPSK9eihTD2SrTBAvwgYsA=
+gitea.com/gitea/act v0.245.2-0.20230516060355-9283cfc9b166/go.mod h1:1ffiGQZAZCLuk9QEBDdbRuQj1GL4uAQk6GNNtcEnPmI=
 github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 h1:w+iIsaOQNcT7OZ575w+acHgRric5iCyQh+xv+KJ4HB8=
 github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78/go.mod h1:LmzpDX56iTiv29bbRTIsUNlaFfuhWRQBWjQdVyAevI8=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=

internal/app/cmd/exec.go

@@ -13,6 +13,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/docker/docker/api/types/container"
 	"github.com/joho/godotenv"
 	"github.com/nektos/act/pkg/artifactcache"
 	"github.com/nektos/act/pkg/artifacts"
@@ -384,7 +385,7 @@ func runExec(ctx context.Context, execArgs *executeArgs) func(cmd *cobra.Command
 			// EventJSON:             string(eventJSON),
 			ContainerNamePrefix:   fmt.Sprintf("GITEA-ACTIONS-TASK-%s", eventName),
 			ContainerMaxLifetime:  maxLifetime,
-			ContainerNetworkMode:  "bridge",
+			ContainerNetworkMode:  container.NetworkMode("bridge"),
 			DefaultActionInstance: execArgs.defaultActionsUrl,
 			PlatformPicker: func(_ []string) string {
 				return execArgs.image

internal/app/run/runner.go

@@ -13,6 +13,7 @@ import (
 	"time"
 
 	runnerv1 "code.gitea.io/actions-proto-go/runner/v1"
+	"github.com/docker/docker/api/types/container"
 	"github.com/nektos/act/pkg/artifactcache"
 	"github.com/nektos/act/pkg/common"
 	"github.com/nektos/act/pkg/model"
@@ -190,7 +191,7 @@ func (r *Runner) run(ctx context.Context, task *runnerv1.Task, reporter *report.
 		EventJSON:             string(eventJSON),
 		ContainerNamePrefix:   fmt.Sprintf("GITEA-ACTIONS-TASK-%d", task.Id),
 		ContainerMaxLifetime:  maxLifetime,
-		ContainerNetworkMode:  r.cfg.Container.NetworkMode,
+		ContainerNetworkMode:  container.NetworkMode(r.cfg.Container.Network),
 		ContainerOptions:      r.cfg.Container.Options,
 		Privileged:            r.cfg.Container.Privileged,
 		DefaultActionInstance: taskContext["gitea_default_actions_url"].GetStringValue(),

internal/pkg/config/config.example.yaml

@@ -42,8 +42,10 @@ cache:
   port: 0
 
 container:
-  # Which network to use for the job containers. Could be bridge, host, none, or the name of a custom network.
-  network_mode: bridge
+  # Specifies the network to which the container will connect.
+  # Could be host, bridge or the name of a custom network.
+  # If it's empty, act_runner will create a network automatically.
+  network: ""
   # Whether to use privileged mode or not when launching task containers (privileged mode is required for Docker-in-Docker).
   privileged: false
   # And other options to be used when the container is started (eg, --add-host=my.gitea.url:host-gateway).

internal/pkg/config/config.go

@@ -10,6 +10,7 @@ import (
 	"time"
 
 	"github.com/joho/godotenv"
+	log "github.com/sirupsen/logrus"
 	"gopkg.in/yaml.v3"
 )
 
@@ -34,7 +35,8 @@ type Config struct {
 		Port    uint16 `yaml:"port"`
 	} `yaml:"cache"`
 	Container struct {
-		NetworkMode   string `yaml:"network_mode"`
+		Network       string `yaml:"network"`
+		NetworkMode   string `yaml:"network_mode"` // Deprecated: use Network instead. Could be removed after Gitea 1.20
 		Privileged    bool   `yaml:"privileged"`
 		Options       string `yaml:"options"`
 		WorkdirParent string `yaml:"workdir_parent"`
@@ -92,9 +94,6 @@ func LoadDefault(file string) (*Config, error) {
 			cfg.Cache.Dir = filepath.Join(home, ".cache", "actcache")
 		}
 	}
-	if cfg.Container.NetworkMode == "" {
-		cfg.Container.NetworkMode = "bridge"
-	}
 	if cfg.Container.WorkdirParent == "" {
 		cfg.Container.WorkdirParent = "workspace"
 	}
@@ -105,5 +104,18 @@ func LoadDefault(file string) (*Config, error) {
 		cfg.Runner.FetchInterval = 2 * time.Second
 	}
 
+	// although `container.network_mode` will be deprecated, but we have to be compatible with it for now.
+	if cfg.Container.NetworkMode != "" && cfg.Container.Network == "" {
+		log.Warn("You are trying to use deprecated configuration item of `container.network_mode`, please use `container.network` instead.")
+		if cfg.Container.NetworkMode == "bridge" {
+			// Previously, if the value of `container.network_mode` is `bridge`, we will create a new network for job.
+			// But “bridge” is easily confused with the bridge network created by Docker by default.
+			// So we set the value of `container.network` to empty string to make `act_runner` automatically create a new network for job.
+			cfg.Container.Network = ""
+		} else {
+			cfg.Container.Network = cfg.Container.NetworkMode
+		}
+	}
+
 	return cfg, nil
 }