Pull request: beta client squashed

Merge in DNS/adguard-home from beta-client-2 to master

Squashed commit of the following:

commit b2640cc49a6c5484d730b534dcf5a8013d7fa478
Merge: 659def862 aef4659e9
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Tue Dec 29 19:23:09 2020 +0300

    Merge branch 'master' into beta-client-2

commit 659def8626467949c35b7a6a0c99ffafb07b4385
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Tue Dec 29 17:25:14 2020 +0300

    all: upgrade github actions node version

commit b4b8cf8dd75672e9155da5d111ac66e8f5ba1535
Author: Vladislav Abdulmyanov <v.abdulmyanov@adguard.com>
Date:   Tue Dec 29 16:57:14 2020 +0300

    all: beta client squashed

client2/scripts/webpack/helpers.js

@@ -0,0 +1,40 @@
+const yaml = require('yaml');
+const fs = require('fs');
+
+const ZERO_HOST = '0.0.0.0';
+const LOCALHOST = '127.0.0.1';
+const DEFAULT_PORT = 80;
+
+const importConfig = () => {
+    try {
+        const doc = yaml.parse(fs.readFileSync('../AdguardHome.yaml', 'utf8'));
+        const { bind_host, bind_port } = doc;
+        return {
+            bind_host,
+            bind_port,
+        };
+    } catch (e) {
+        return {
+            bind_host: ZERO_HOST,
+            bind_port: DEFAULT_PORT,
+        };
+    }
+};
+
+const getDevServerConfig = () => {
+    const { bind_host: host, bind_port: port } = importConfig();
+    const { DEV_SERVER_PORT } = process.env;
+
+    const devServerHost = host === ZERO_HOST ? LOCALHOST : host;
+    const devServerPort = 3000 || port + 8000;
+
+    return {
+        host: devServerHost,
+        port: devServerPort
+    };
+};
+
+module.exports = {
+    importConfig,
+    getDevServerConfig
+};