add container package to use; add credential for login; add code checkout to pull the code.

Author: aleksandr-kotlyar

.github/workflows/main.yml

@@ -5,6 +5,11 @@ jobs:
   pytest:
     name: Pytest
     runs-on: ubuntu-latest
-    container: docker.pkg.github.com/aleksandr-kotlyar/python_and_gitlab/python-3.7.6-alpine-req:ver-14-mimesis-4.1.2
+    container:
+      image: docker.pkg.github.com/aleksandr-kotlyar/python_and_gitlab/python-3.7.6-alpine-req:ver-14-mimesis-4.1.2
+      credentials:
+        username: ${{ github.actor }}
+        password: ${{ secrets.ghcr_token }}
+    uses: actions/checkout@v2
     steps:
     - run: pytest src/test/test_api.py