add action to deploy cloud function

.github/workflows/deploy.yml

@@ -0,0 +1,33 @@
+
+name: 'Deploy Google Cloud Function'
+
+jobs:
+  deploy:
+    permissions:
+      contents: 'read'
+      id-token: 'write'
+
+    steps:
+    - id: 'Checkout'
+      uses: 'actions/checkout@v3'
+
+    - id: 'Google Cloud Authentication'
+      uses: 'google-github-actions/auth@v1'
+      with:
+        credentials_json: ${{ secrets.CLOUD_CREDENTIALS }}
+
+    - id: 'Deploy Cloud Function'
+      uses: 'google-github-actions/deploy-cloud-functions@v1'
+      with:
+        description: 'Ping selected group of members on mattermost when coffee is mentioned'
+        name: 'coffee2'
+        runtime: 'go119'
+        memory_mb: 1
+        region: 'europe-west1'
+
+    - id: 'Test #1'
+      run: 'echo "This should fail (no token)"; "curl "${{ steps.deploy.outputs.url }}" || true'
+
+    - id: 'Test #2'
+      run: 'echo "This should succeed"; "curl "${{ steps.deploy.outputs.url }}" || true'
+