Add workflow for building live branches (#35344)

* Add workflow for building live branches

* Fix inadvertent newline

* Only run on PR for default types

.github/workflows/pr-build-live-branch.yml

@@ -0,0 +1,83 @@
+name: Build Live Branch
+on:
+  pull_request:
+
+concurrency:
+  # Cancel concurrent jobs on pull_request but not push, by including the run_id in the concurrency group for the latter.
+  group: build-${{ github.event_name == 'push' && github.run_id || 'pr' }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  build:
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v3
+      
+      - name: Get current version
+        id: version
+        uses: actions/github-script@v6.3.3
+        with:
+          script:
+            const { getVersion } = require( './.github/workflows/scripts/get-plugin-version' );
+            const version = await getVersion( 'woocommerce' );
+            core.setOutput( 'version', version );
+      
+      - name: Setup WooCommerce Monorepo
+        uses: ./.github/actions/setup-woocommerce-monorepo
+        with:
+          build: false
+
+      - name: Prepare plugin zips
+        id: prepare
+        env:
+          CURRENT_VERSION: ${{ steps.version.outputs.version }}
+        run: |
+        
+          # Current version must compare greather than any previously used current version for this PR.
+          # Assume GH run IDs are monotonic.
+          VERSUFFIX="${GITHUB_RUN_ID}-g$(git rev-parse --short HEAD)"
+          
+          CURRENT_VERSION="$CURRENT_VERSION-$VERSUFFIX"
+          
+          sed -i -e 's/Version: .*$/Version: '"$CURRENT_VERSION"'/' "$GITHUB_WORKSPACE/plugins/woocommerce/woocommerce.php"
+          echo "$CURRENT_VERSION" > "$GITHUB_WORKSPACE/plugins/woocommerce/version.txt"
+          
+          cd "$GITHUB_WORKSPACE/plugins/woocommerce"
+          bash bin/build-zip.sh
+          
+          mkdir "$GITHUB_WORKSPACE/zips"
+          cp "$GITHUB_WORKSPACE/plugins/woocommerce/woocommerce.zip" "$GITHUB_WORKSPACE/zips/woocommerce.zip"
+          cd "$GITHUB_WORKSPACE/zips"
+          unzip woocommerce.zip
+          rm woocommerce.zip
+          mv woocommerce woocommerce-dev
+          zip -q -r "woocommerce-dev.zip" "woocommerce-dev/"
+          rm -fR "$GITHUB_WORKSPACE/zips/woocommerce-dev"
+        
+          # Plugin data is passed as a JSON object.
+          PLUGIN_DATA="{}"          
+          PLUGIN_DATA=$( jq -c --arg slug "woocommerce" --arg ver "$CURRENT_VERSION" '.[ $slug ] = { version: $ver }' <<<"$PLUGIN_DATA" )
+          echo "plugin-data=$PLUGIN_DATA" >> $GITHUB_OUTPUT
+          
+      - name: Create plugins artifact
+        uses: actions/upload-artifact@v3
+        if: steps.prepare.outputs.plugin-data != '{}'
+        with:
+          name: plugins
+          path: zips
+          # Only need to retain for a day since the beta builder slurps it up to distribute.
+          retention-days: 1
+          
+      - name: Inform Beta Download webhook
+        if: steps.prepare.outputs.plugin-data != '{}'
+        env:
+          SECRET: ${{ secrets.WOOBETA_SECRET }}
+          PLUGIN_DATA: ${{ steps.prepare.outputs.plugin-data }}
+          PR: ${{ github.event.number }}
+        run: |
+          curl -v --fail -L \
+            --url "https://betadownload.jetpack.me/gh-action.php?run_id=$GITHUB_RUN_ID&pr=$PR&commit=$GITHUB_SHA" \
+            --form-string "repo=$GITHUB_REPOSITORY" \
+            --form-string "branch=${GITHUB_REF#refs/heads/}" \
+            --form-string "plugins=$PLUGIN_DATA" \
+            --form-string "secret=$SECRET"

.github/workflows/scripts/get-plugin-version.js

@@ -0,0 +1,13 @@
+const { readFile } = require( 'fs/promises' );
+const { join } = require( 'path' );
+
+exports.getVersion = async plugin => {
+	const filePath = join(
+		process.env.GITHUB_WORKSPACE,
+		`plugins/${ plugin }/${ plugin }.php`
+	);
+	const pluginFileContents = await readFile( filePath, 'utf8' );
+	const versionMatch = pluginFileContents.match( /Version: (\d+\.\d+\.\d+.*)\n/m );
+	return versionMatch && versionMatch[1];
+};
+