Prepare to build releases from branches

.github/workflows/build-vscode-extension.yml

@@ -12,6 +12,11 @@ on:
         required: false
         type: string
         default: snapshot
+      ref:
+        description: Git branch, tag, commit hash
+        required: false
+        default: 'main'
+        type: string
 
 permissions:
   contents: write
@@ -23,6 +28,8 @@ jobs:
     steps:
       - name: Checkout vscode-extensions code and workflow scripts
         uses: actions/checkout@v4
+        with:
+          ref: ${{ inputs.ref }}
       - name: Set up JDK 17
         uses: actions/setup-java@v4
         with: