Increase fetch interval for Codeberg

Increase the fetch interval to at least 30 seconds if the runner is
configured to be used with Codeberg. This avoids it being rate limited
when they do actual work and reduces load on Codeberg.

internal/app/cmd/daemon.go

@@ -45,6 +45,8 @@ func runDaemon(ctx context.Context, configFile *string) func(cmd *cobra.Command,
 			return fmt.Errorf("failed to load registration file: %w", err)
 		}
 
+		cfg.Tune(reg.Address)
+
 		lbls := reg.Labels
 		if len(cfg.Runner.Labels) > 0 {
 			lbls = cfg.Runner.Labels

internal/pkg/config/config.go

@@ -68,6 +68,16 @@ type Config struct {
 	Host      Host      `yaml:"host"`      // Host represents the configuration for the host.
 }
 
+// Tune the config settings accordingly to the Forgejo instance that will be used.
+func (c *Config) Tune(instanceURL string) {
+	if instanceURL == "https://codeberg.org" {
+		if c.Runner.FetchInterval < 30*time.Second {
+			log.Info("The runner is configured to be used by a public instance, fetch interval is set to 30 seconds.")
+			c.Runner.FetchInterval = 30 * time.Second
+		}
+	}
+}
+
 // LoadDefault returns the default configuration.
 // If file is not empty, it will be used to load the configuration.
 func LoadDefault(file string) (*Config, error) {

internal/pkg/config/config_test.go

@@ -0,0 +1,37 @@
+// Copyright 2024 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package config
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestConfigTune(t *testing.T) {
+	c := &Config{
+		Runner: Runner{},
+	}
+
+	t.Run("Public instance tuning", func(t *testing.T) {
+		c.Runner.FetchInterval = 60 * time.Second
+		c.Tune("https://codeberg.org")
+		assert.EqualValues(t, 60*time.Second, c.Runner.FetchInterval)
+
+		c.Runner.FetchInterval = 2 * time.Second
+		c.Tune("https://codeberg.org")
+		assert.EqualValues(t, 30*time.Second, c.Runner.FetchInterval)
+	})
+
+	t.Run("Non-public instance tuning", func(t *testing.T) {
+		c.Runner.FetchInterval = 60 * time.Second
+		c.Tune("https://example.com")
+		assert.EqualValues(t, 60*time.Second, c.Runner.FetchInterval)
+
+		c.Runner.FetchInterval = 2 * time.Second
+		c.Tune("https://codeberg.com")
+		assert.EqualValues(t, 2*time.Second, c.Runner.FetchInterval)
+	})
+}