Merge pull request #112 from uyjulian/ci_fix_docker_tag

CI: fix missing reference to DOCKER_TAG

Author: uyjulian

.github/workflows/docker.yml

@@ -43,6 +43,16 @@ jobs:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
 
+    - name: Extract DOCKER_TAG using tag name
+      if: startsWith(github.ref, 'refs/tags/')
+      run: |
+        printf 'DOCKER_TAG=%s\n' "${GITHUB_REF/refs\/tags\//}" >> $GITHUB_ENV
+    
+    - name: Use default DOCKER_TAG
+      if: startsWith(github.ref, 'refs/tags/') != true
+      run: |
+        printf 'DOCKER_TAG=%s\n' "latest" >> $GITHUB_ENV
+
     - name: Prepare additional environment variables from repo
       run: if test -f ./config/ci-docker-env.ini; then cat ./config/ci-docker-env.ini | sed -e 's/$REPOSITORY_OWNER/'"${{ github.repository_owner }}"'/g;s/$DOCKER_TAG/'"${{ env.DOCKER_TAG }}"'/g' >> $GITHUB_ENV; fi