use joystream-node version as docker image tag

.github/workflows/run-network-tests-privileged.yml

@@ -8,7 +8,7 @@ jobs:
     name: Build new images
     runs-on: ubuntu-latest
     outputs:
-      joystream_node_tag: ${{ steps.select_image_tag.outputs.tag }}
+      joystream_node_tag: ${{ steps.docker_build.outputs.tag }}
     steps:
       - uses: actions/checkout@v1
       - name: Login to DockerHub
@@ -16,12 +16,15 @@ jobs:
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_PASSWORD }}
-      - id: select_image_tag
-        name: Build docker images
+      # TODO: Try to not build a new image: compute a hash over rust code and use that as the docker
+      # image tag. (Normally this would be the git repo commit hash but the monorepo contains multiple projects
+      # that is why it is not effective.)
+      - id: docker_build
+        name: Build and publish docker images
         run: |
-          export JOYSTREAM_NODE_TAG=$GITHUB_REF
-          echo "DEBUG: JOYSTREAM_NODE_TAG=${JOYSTREAM_NODE_TAG}"
           docker-compose build
+          export JOYSTREAM_NODE_TAG=`docker run joystream/node --version | sed -e 's/^joystream-node //' | tr -d '\n' | tr -d '\r'`
+          docker image tag joystream/node joystream/node:${JOYSTREAM_NODE_TAG}
           docker push joystream/node:${JOYSTREAM_NODE_TAG}
           echo "::set-output name=tag::${JOYSTREAM_NODE_TAG}"