Initial commit for appengine deploy action

.github/workflows/appengine_deploy.yml

@@ -0,0 +1,54 @@
+# This is a basic workflow to help you get started with Actions
+
+name: Deploy to App Engine
+
+# Controls when the workflow will run
+on:
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  prepare:
+    name: Prepare
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
+
+      - name: Prepare demo files
+        run: |
+          npm install
+          npm run prepareDemos
+
+      - name: Upload
+        uses: actions/upload-artifact@v2
+        with:
+          name: appengine_files
+          path: _deploy/
+
+  deploy:
+    name: Deploy
+    runs-on: ubuntu-latest
+    needs: prepare
+    steps:
+      - name: Download prepared files
+        uses: actions/download-artifact@v2
+        with:
+          name: appengine_files
+          path: _deploy/
+
+      - name: Deploy to App Engine
+        uses: google-github-actions/deploy-appengine@v0.2.0
+        with:
+          deliverables: app.yaml
+          working_directory: _deploy/
+          # TODO: Set up project id and credentials secrets
+          project_id: ${{ secrets.GCP_PROJECT }}
+          credentials: ${{ secrets.GCP_SA_KEY }}
+          promote: false
+          # TODO: Generate a version string based on package.json
+          version: vtest