show github repository in built site

{{cookiecutter.repo_name}}/.github/workflows/publish.yml

@@ -22,7 +22,8 @@ jobs:
       uses: actions/checkout@v2
     - name: build
       run: |
-        xvfb-run make V=2 -O -j$(nproc) jekyll
+        echo "sourceurl: https://github.com/${GITHUB_REPOSITORY}" >> _config.yml
+        env JEKYLL_ENV=production xvfb-run make V=2 -O -j$(nproc) jekyll
     - if: github.event_name == 'push' && github.ref == 'refs/heads/{{ cookiecutter.main_branch_name }}'
       name: publish
       run: |

{{cookiecutter.repo_name}}/_layouts/base.html

@@ -43,6 +43,9 @@
     <p>
     {% raw %}
     This 3D printable project is offered under <a href="{{ relative }}LICENSE.html">an open source license</a>.
+{% if site.sourceurl and site.sourceurl != "" %}
+    The source is managed at <a href="{{ site.sourceurl }}">{{ site.sourceurl }}</a>.
+{% endif %}
     The site is built with software under <a href="{{ relative }}other-licenses.html">various open source licenses</a>.
     {% endraw %}
     Create your own MySTL site with <a href="https://github.com/jepler/cookiecutter-mystl">cookiecutter-mystl</a>.