Meta: (test.yml) Don't count lint failure as job failure

It's more valuable to see at a glance that the tests passed than to
have every run indicate failure because of lint failures, especially
when some of the lint failures come from package-lint issues that may
be patched in the future.

.github/workflows/test.yml

@@ -61,6 +61,7 @@ jobs:
     # as failures, so linting and testing are run as separate steps.
 
     - name: Lint
+      continue-on-error: true
       run: ./makem.sh -vv --sandbox-dir=$SANDBOX_DIR lint
 
     - name: Test