Let github actions run all non-manifest tests

Author: mielvds

.github/workflows/main.yaml

@@ -68,6 +68,7 @@ jobs:
         pytest --tests=./specifications/json-ld-api/tests --loader=${{ matrix.loader }}
         pytest --tests=./specifications/json-ld-framing/tests --loader=${{ matrix.loader }}
         pytest --tests=./specifications/normalization/tests --loader=${{ matrix.loader }}
+        pytest --ignore ./tests/test_manifests.py
       env:
         LOADER: ${{ matrix.loader }}
   #coverage: