Tag image with latest and version tag (#9)

Author: wafer-bw

cloudbuild.yaml

@@ -3,11 +3,12 @@ steps:
     entrypoint: 'bash'
     args: [
         '-c',
-        'DOCKER_BUILDKIT=1 docker build -t gcr.io/$PROJECT_ID/$REPO_NAME:$TAG_NAME --build-arg TOKEN=$$TOKEN . --file=./Dockerfile' ]
+        'DOCKER_BUILDKIT=1 docker build -t gcr.io/$PROJECT_ID/$REPO_NAME:latest -t gcr.io/$PROJECT_ID/$REPO_NAME:$TAG_NAME --build-arg TOKEN=$$TOKEN . --file=./Dockerfile' ]
     secretEnv:
       - 'TOKEN'
 images:
   - 'gcr.io/$PROJECT_ID/$REPO_NAME:$TAG_NAME'
+  - 'gcr.io/$PROJECT_ID/$REPO_NAME:latest'
 timeout: 6000s
 options:
   env: