Add SHA tag to Docker image in workflow

Author: Jorman

.github/workflows/build-emulerr-stalled.yml

@@ -28,5 +28,6 @@ jobs:
           push: true
           tags: |
             ${{ secrets.DOCKERHUB_USERNAME }}/emulerr-stalled-checker:latest
+            ${{ secrets.DOCKERHUB_USERNAME }}/emulerr-stalled-checker:${{ github.sha }}
           cache-from: type=gha
           cache-to: type=gha,mode=max