Update prod.docker.yml

Author: ngoerlitz

.github/workflows/prod.docker.yml

@@ -1,8 +1,9 @@
-name: Build latest image
+name: Build prod image
 
 on:
   push:
-    branches: [ "main" ]
+    branches-ignore:
+      - main
 
 env:
   REGISTRY: ghcr.io
@@ -16,6 +17,10 @@ jobs:
       packages: write
 
     steps:
+      - name: Extract commit SHA
+        run:
+          echo "SHORT_SHA=`echo ${GITHUB_SHA} | cut -c1-8`" >> $GITHUB_ENV
+
       - name: Checkout repository
         uses: actions/checkout@v4
 
@@ -28,5 +33,5 @@ jobs:
 
       - name: Build and push Docker image
         run: |
-          docker build --pull -t ${{ env.REGISTRY }}/${{ github.repository }}:latest .
+          docker build --pull --build-arg COM_SHA=${{ env.SHORT_SHA }} -t ${{ env.REGISTRY }}/${{ github.repository }}:latest .
           docker push ${{ env.REGISTRY }}/${{ github.repository }}:latest