target_user=apache
          if [ "$GITHUB_EVENT_NAME" == "pull_request" ]; then
            user=${PR_HEAD_LABEL%:*}
            branch=${PR_HEAD_LABEL#*:}
          else
            user=${GITHUB_REPOSITORY%/*}
            branch=${GITHUB_REF#refs/heads/}
          fi
          if [ $branch != "master" ]; then
            git ls-remote https://github.com/$user/$repo.git | grep "refs/heads/${branch}$" > /dev/null

      - name: Extract tarball
        shell: bash
        run: |
          set +e
          if [ -f ${{ env.TAR_BALL }} ]; then
            temp_dir=$(mktemp -d)
            tar -xzf ${{ env.TAR_BALL }} -C "$temp_dir" --strip 1
            maven_bin_dir=$temp_dir/bin
            if [ -d $maven_bin_dir ]; then
              echo "tar.gz file \"${{ env.TAR_BALL }}\" successfully extracted in temporarily directory \"$temp_dir.\""