DEVX-1: fix: use python3 and venv python in workflows and Makefile

.gitea/workflows/publish.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Install CI tools
         run: |
           export PATH="$HOME/.local/bin:$PATH"
-          python -m devx.tools.install_tools --tool git-cliff --tool tea
+          python3 -m devx.tools.install_tools --tool git-cliff --tool tea
       - name: Configure tea login
         env:
           REPO_TOKEN: ${{ secrets.REPO_TOKEN }}
@@ -34,7 +34,7 @@ jobs:
           PYTHONPATH: src
         run: |
           export PATH="$HOME/.local/bin:$PATH"
-          python -m devx.ci.publish "${{ github.ref_name }}" "${{ github.repository }}"
+          python3 -m devx.ci.publish "${{ github.ref_name }}" "${{ github.repository }}"
       - name: Notify on failure
         if: failure()
         env:
@@ -42,7 +42,7 @@ jobs:
           PYTHONPATH: src
         run: |
           export PATH="$HOME/.local/bin:$PATH"
-          python -m devx.ci.notify_failure \
+          python3 -m devx.ci.notify_failure \
             --repo "${{ github.repository }}" \
             --run-id "${{ github.run_id }}" \
             --workflow "publish" \