Fix gtihub workflow

Author: ababak

.github/workflows/docker-image.yml

@@ -23,8 +23,7 @@ jobs:
       - name: Set output variables
         id: vars
         run: |
-          echo "::set-output name=cgcpp_version::$(python setup.py --version)"
-          echo "::set-output name=docker_tag::$($(python setup.py --version) -replace '\.\w+$')"
+          echo "docker_tag=$('${{ github.ref_name }}' -replace '^v', '' -replace '\.\w+$', '')" >> $GITHUB_OUTPUT
 
       - name: Build Docker image
         run: docker build . --file Dockerfile --tag ababak/cgcpp:${{ steps.vars.outputs.docker_tag }}