CI: check that all files are listed in Filelist (#13601)

Sometimes patches add files that should be included in tarballs for
distribution, but are not added to Filelist (used by Makefile to build
the tar archive).  This can break the build, or it can be silently
ignored as runtime files are simply not included in the distribution.

Add a CI check to ensure all files tracked in the repository are
assigned to a variable in Filelist.  A few files were not listed because
they do not need to be included in builds and tarballs, so add an IGNORE
variable for these exceptions.

Co-authored-by: Peter Simonyi <pts@petersimonyi.ca>
Signed-off-by: Christian Brabandt <cb@256bit.org>

.github/workflows/ci.yml

@@ -81,6 +81,12 @@ jobs:
       - name: Checkout repository from github
         uses: actions/checkout@v4
 
+      - name: Check Filelist (for packaging)
+        run: |
+          # If any files in the repository are not listed in Filelist this will
+          # exit with an error code and list the missing entries.
+          make -f ci/unlisted.make
+
       - run: sudo dpkg --add-architecture i386
         if: matrix.architecture == 'i386'