fixing the docker build context to use the already checked out code f…

…rom github checkout action

.github/workflows/tests.yml

@@ -32,6 +32,7 @@ jobs:
           GHOST_API_URL: https://blog.podkrepi.bg
           GHOST_CONTENT_KEY: ${{ secrets.GHOST_CONTENT_KEY }}
         with:
+          context: .
           push: false
           target: runner
           build-args: |