test pass secret to docker from github action

.github/workflows/build-n-push-main.yml

@@ -48,7 +48,7 @@ jobs:
       - name: RELEASE CANDIDATE - Build jar and Docker image 
         run: |
           docker build \
-          --secret id=my_user,src="test" \
+          --secret id=my_user,src=${{ secrets.GIT_USER }} \
           -f src/main/docker/Dockerfile.multistage \
           -t ghcr.io/${{ github.repository }}:${{ github.head_ref || github.ref_name }}  \
           .