Create deploy_gcr.yml

.github/workflows/deploy_gcr.yml

@@ -0,0 +1,26 @@
+name: Deploy to GCR
+
+on:
+  release:
+    types: [created]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+      name: Checkout
+
+    - name: Set up Ruby 2.6
+      uses: actions/setup-ruby@v1
+      with:
+        ruby-version: 2.6.x
+
+    - uses: GoogleCloudPlatform/github-actions/setup-gcloud@master
+      with:
+        version: '270.0.0'
+        service_account_email: ${{ secrets.GCP_EMAIL }}
+        service_account_key: ${{ secrets.GCP_KEY }}
+
+    - run: gcloud auth configure-docker
+    - run: ruby docker.rb push