Fix externally-managed-environment issue for new Ubuntu

Author: szabozoltan69

.github/workflows/build-publish-docker-helm.yml

@@ -39,13 +39,16 @@ jobs:
 
     - name: Install chart publishing dependencies (chartpress, helm)
       run: |
+        python3 -m venv venv
+        source venv/bin/activate
         pip install chartpress
         pip list
 
         helm version
 
     - name: Build and push Docker image. Update the image tag, chart version etc as needed
       run: |
+        source venv/bin/activate
         cd deploy/helm
         # hack to push the image to ghcr.io. We will update chartpress.yaml when we move to separate deploy repo
         python -c "import re; data=open('chartpress.yaml').read(); open('chartpress.yaml', 'w').write(re.sub(r'ifrcgoacr.azurecr.io/ifrcgo-', 'ghcr.io/ifrcgo/go-', data))"