Move lints into a separate step and allow them to fail for now

Author: jerith

.github/workflows/ci.yaml

@@ -57,6 +57,11 @@ jobs:
         run: |
           # This is basically `mix test` with coverage enabled.
           mix coveralls.json
+
+      - name: Lints
+        # Let the build succeed for now even if the lints fail.
+        continue-on-error: true
+        run: |
           mix format --check-formatted
           # This will mention FIXME and TODO comments without failing, any
           # other issue fails the build.