Correct username for docker/logi-action GitHub action

.github/workflows/master-ci.yml

@@ -30,20 +30,12 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
 
-      - name: Login to production CR
-        uses: docker/login-action@v1
-        if: ${{ steps.prep.outputs.login_prod_cr  }}
-        with:
-          registry: ${{ env.DOCKER_PROD_REGISTRY }}
-          username: ${{ secrets.DOCKER_PROD_USERNAME }}
-          password: ${{ secrets.DOCKER_PROD_PASSWORD }}
-
       - name: Login to CR
         uses: docker/login-action@v1
         if: ${{ steps.prep.outputs.login_cr }}
         with:
           registry: ${{ env.DOCKER_REGISTRY }}
-          username: ${{ secrets.DOCKER_GITHUB_USER }}
+          username: ${{ github.actor }}
           password: ${{ secrets.DOCKER_GITHUB_PASSWORD }}
 
       - name: Build base image