Fix and Test for GitHub Action (#117)

* use context attributes for docker build
* remove target attribute for docker build

.github/workflows/build-image-latest.yaml

@@ -44,13 +44,12 @@ jobs:
         id: docker_build
         uses: docker/build-push-action@v2
         with:
-          file: docker-${{ matrix.component }}
+          context: docker-${{ matrix.component }}
           push: true
-          target: prod
           tags: ${{ secrets.DOCKERHUB_REPO }}/docker-osm:${{ matrix.component }}-latest
           cache-from: |
             type=gha,scope=prod
           cache-to: type=gha,scope=prod
 
       - name: Image digest
-        run: echo ${{ steps.docker_build.outputs.digest }}
+        run: echo ${{ steps.docker_build.outputs.digest }}