ci: Remove Docker test environment from CI (#806)

.github/workflows/workflow.yml

@@ -152,24 +152,6 @@ jobs:
           command: test
           args: -- -Z unstable-options --include-ignored
 
-  # Run the tests in the Docker image
-  docker_test:
-    name: Test in Docker
-    needs: [cargo_check]
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - name: Pull the pre-built Docker image
-        run: docker pull starshipcommand/starship-test
-      - name: Fix file permissions
-        run: chmod -R a+w .
-      - name: Build the Docker image
-        run:
-          docker build -f tests/Dockerfile --tag starshipcommand/starship-test --cache-from
-          starshipcommand/starship-test .
-      - name: Run tests in Docker
-        run: docker run --rm -v $(pwd):/src/starship starshipcommand/starship-test
-
   # Publish starship to Crates.io
   cargo_publish:
     if: startsWith(github.ref, 'refs/tags/v')