Updated workflow to run the ./manage.py spectacular --color --file sc…

…hema.yml command in the mathesar_service_dev container.

.github/workflows/update-api-docs.yml

@@ -23,11 +23,7 @@ jobs:
         run: docker compose -f docker-compose.yml -f docker-compose.dev.yml up dev-service
 
       - name: Generate API documentation
-        uses: addnab/docker-run-action@v3
-        with:
-          image: mathesar/mathesar-dev:latest
-          run: ./manage.py spectacular --color --file schema.yml
-          shell: python
+        run: docker exec -it mathesar_service_dev ./manage.py spectacular --color --file schema.yml
 
       - name: Check if schema file has changed
         run: git diff --quiet schema.yml || exit 0