chore: test that the VCS check doesn't break things

Signed-off-by: Brian Harring <ferringb@gmail.com>

Author: ferringb

.github/workflows/test.yml

@@ -35,6 +35,17 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@v4
 
+    - name: Reject any VCS dependencies
+      shell: python
+      run: |
+        import re, tomllib
+        deps = tomllib.load(open('pyproject.toml', 'rb'))['build-system']['requires']
+        if rejects := list(filter(re.compile(r'@[^+]+').search, deps)):
+          rejects = "  \n".join(sorted(rejects))
+          raise Exception(f'VCS dependencies were detected in [build-system]:\n  {rejects}')
+
+
+
     - name: Pin dependencies to minimal versions
       if: ${{ matrix.deps == 'minimal-deps' }}
       run: sed -e '/dependencies/,$s/~=/==/' -i pyproject.toml