test-packaging.yaml: Add in-tree integration tests

Add a post-build step which runs integration tests against the source
code repository (as opposed to against the installed package).

Signed-off-by: Jan Lindemann <jan@janware.com>

.github/workflows/test-packaging.yaml

@@ -66,6 +66,12 @@ jobs:
           set -euxo pipefail
           make -C "${{ github.event.repository.name }}" check
 
+      - name: Run post-build integration tests against repo
+        shell: bash
+        run: |
+          set -euxo pipefail
+          make -C "${{ github.event.repository.name }}" test
+
       - name: Install package
         shell: bash
         run: |