test-packaging.yaml: Add static code checks

Add pre- and post-build static code checks via "make check". A repository should specify all checks that it wants to run during CI as dependencies of target "check" in the toplevel Makefile.
Signed-off-by: Jan Lindemann <jan@janware.com>

.github/workflows/test-packaging.yaml

@@ -40,6 +40,12 @@ jobs:
           make -C build-jw-foss pkg-install-release-deps
           OFFLINE=true make -C build-jw-foss pkg-rebuild-reinstall
 
+      - name: Run pre-build static code checks
+        shell: bash
+        run: |
+          set -euxo pipefail
+          make -C "${{ github.event.repository.name }}" check
+
       - name: Build package
         shell: bash
         run: |
@@ -48,6 +54,12 @@ jobs:
           make -C "${{ github.event.repository.name }}" pkg-install-testbuild-deps
           make -C "${{ github.event.repository.name }}" pkg-rebuild
 
+      - name: Run post-build static code checks
+        shell: bash
+        run: |
+          set -euxo pipefail
+          make -C "${{ github.event.repository.name }}" check
+
       - name: Install package
         shell: bash
         run: |