[CI] Try running actions with docker-compose

.github/prepare-docker-image/action.yml

@@ -12,8 +12,8 @@ runs:
       with:
         cache-from: type=gha
         load: true
-        tags: e621:test
+        tags: e621
 
     - name: Set docker run command
-      run: echo "DOCKER_RUN=docker run --rm --network host -e POSTGRES_HOST=localhost -e RAILS_ENV=test -e CI=true -v $PWD:/app e621:test" >> "$GITHUB_ENV"
+      run: echo "DOCKER_RUN=docker-compose run -e CI=true" >> "$GITHUB_ENV"
       shell: bash

.github/workflows/checks.yml

@@ -24,7 +24,7 @@ jobs:
         with:
           cache-from: type=gha
           cache-to: type=gha,mode=max
-          tags: e621:test
+          tags: e621
 
   rubocop:
     runs-on: ubuntu-latest
@@ -35,4 +35,4 @@ jobs:
       - uses: ./.github/prepare-docker-image
 
       - name: Run Rubocop
-        run: $DOCKER_RUN bundle exec rubocop --format github
+        run: $DOCKER_RUN rubocop --format github