Extract Branch Name

.github/workflows/build-reference.yml

@@ -7,7 +7,6 @@ on:
 
 env:
   GH_ACTIONS_REPO_TOKEN: ${{ secrets.GH_ACTIONS_REPO_TOKEN }}
-  GENERATED_BRANCH_NAME: ${GITHUB_REPOSITORY}/${GITHUB_REF##*/}
 
 jobs:
   build:
@@ -17,10 +16,13 @@ jobs:
         uses: actions/checkout@v2
       - name: Generate antora.yml
         run: ./gradlew :spring-security-docs:generateAntora
+      - name: Extract Branch Name
+        id: extract_branch_name
+        run: echo "##[set-output name=branch_name;]$(echo ${GITHUB_REF##*/})"
       - name: Push generated antora files to the spring-generated-docs
         uses: JamesIves/github-pages-deploy-action@4.1.4
         with:
-          branch:  ${{ env.GENERATED_BRANCH_NAME }} # The branch the action should deploy to.
+          branch:  ${{ steps.extract_branch_name.outputs.branch_name }} # The branch the action should deploy to.
           folder: "docs/build/generateAntora" # The folder the action should deploy.
           repository-name: "spring-io/spring-generated-docs"
           token: ${{ secrets.GH_ACTIONS_REPO_TOKEN }}