try to fix

.github/workflows/docker.yml

@@ -10,13 +10,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@master
-    - name: Get release version
-      id: get_version
-      run: echo ::set-env name=RELEASE_VERSION::$(echo ${GITHUB_REF:10})
     - name: Publish to Registry
       uses: elgohr/Publish-Docker-Github-Action@master
       with:
         name: vadv/prometheus-exporter-merger
-        username: ${{ secrets.DOCKER_USERNAME }}
+        username: vadv
         password: ${{ secrets.DOCKER_PASSWORD }}
-        tags: "latest,${{ env.RELEASE_VERSION }}"
+        tag_names: true