Update test-docker-build.yml

.github/workflows/test-docker-build.yml

@@ -11,7 +11,7 @@ jobs:
     name: "Build all modified docker images"
     runs-on: ubuntu-latest
     outputs:
-      docker-matrix: ${{ steps.set-matrix.outputs.matrix }}
+      matrix: ${{ steps.set-matrix.outputs.matrix }}
     steps:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
@@ -35,15 +35,10 @@ jobs:
           echo ${{ steps.changed-files.outputs.all_changed_files}}
           echo "matrix=${{ steps.changed-files.outputs.all_changed_files}}" >> $GITHUB_OUTPUT
   build_modified_files:
+    runs-on: ubuntu-latest
     needs: get_changed_files
     name: Build Docker images on modified files
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        docker-file: ${{ fromJSON(needs.get_changed_files.outputs.matrix) }} # https://docs.github.com/en/actions/learn-github-actions/expressions#example-returning-a-json-object
     steps:
-      - name: Build Docker image
-        uses: docker/build-push-action@v4
-        with:
-          context: ${{ matrix.docker-file }}
-          push: False
+      - name: Print env variables
+        run: |
+          echo ${{ fromJSON(needs.get_changed_files.outputs.matrix) }}