[ci] Publish docs only if installation test succeeds

The test-installation step failing means that it is not possible to
install this python package on all-architectures. It is best not to update
published docs for a version that does not satisfy the requirement of being
installable on all intended target architectures.

Note that the test-installation step runs only if the build step is
successful.

Signed-off-by: Tiyash Basu <[email protected]>

Author: tiyash-basu-frequenz

.github/workflows/ci.yaml

@@ -146,7 +146,7 @@ jobs:
 
   publish-docs:
     name: Publish documentation website to GitHub pages
-    needs: ["nox", "build"]
+    needs: ["nox", "test-installation"]
     if: github.event_name == 'push'
     runs-on: ubuntu-20.04
     permissions: