Allow packages without plugins to build again

Packages (like pulp_file and pulp-certguard) that do not provide any
plugin anymore, bindings artifacts are not generated and so should not
be attempted to be uploaded or published after all.
We may however still be able to ship the "empty" package.

templates/github/.github/workflows/build.yml.j2

@@ -61,6 +61,7 @@ jobs:
           if-no-files-found: "error"
           retention-days: 5
           overwrite: true
+      {%- if plugins %}
       {{ run_script(name="Build Python bindings packages", file="build_python_client.sh") | indent(6) }}
       - name: "Upload python client packages"
         uses: "actions/upload-artifact@v4"
@@ -98,4 +99,5 @@ jobs:
           retention-days: 5
           overwrite: true
       {%- endif %}
+      {%- endif %}
 ...

templates/github/.github/workflows/publish.yml.j2

@@ -53,6 +53,7 @@ jobs:
           .github/workflows/scripts/publish_plugin_pypi.sh {{ "${{ github.ref_name }}" }}
   {%- endif %}
 
+  {%- if plugins %}
   {%- if deploy_client_to_pypi %}
   publish-python-bindings:
     runs-on: "ubuntu-latest"
@@ -120,6 +121,7 @@ jobs:
         run: |
           bash .github/workflows/scripts/publish_client_gem.sh {{ "${{ github.ref_name }}" }}
   {%- endif %}
+  {%- endif %}
 
   create-gh-release:
     runs-on: "ubuntu-latest"
@@ -128,12 +130,14 @@ jobs:
       {%- if deploy_to_pypi %}
       - "publish-package"
       {%- endif %}
+      {%- if plugins %}
       {%- if deploy_client_to_pypi %}
       - "publish-python-bindings"
       {%- endif %}
       {%- if deploy_client_to_rubygems %}
       - "publish-ruby-bindings"
       {%- endif %}
+      {%- endif %}
 
     steps:
       - name: "Create release on GitHub"

templates/github/.github/workflows/test.yml.j2

@@ -59,6 +59,7 @@ jobs:
         with:
           name: "api_spec"
           path: "{{ plugin_name }}/"
+      {%- if plugins %}
 
       - name: "Download client packages"
         uses: "actions/download-artifact@v4"
@@ -75,6 +76,7 @@ jobs:
           tar xvf "../../{{ plugin_name }}/{{ plugin.app_label }}-python-client.tar"
           popd
           {%- endfor %}
+      {%- endif %}
 
       {{ install_python_deps(["towncrier", "twine", "wheel", "httpie", "docker", "netaddr", "boto3", "ansible", "mkdocs", "jq", "jsonpatch"]) | indent(6) }}