fix pre-commit check for CONTRIBUTING.md (#1098)

CONTRIBUTING.md

@@ -202,29 +202,40 @@ The final step to make sure your newly added image gets published is to update t
 ### Manually testing within a workspace
 
 If you want to manually test with a debug workspace, you can do the following:
+
 1. Open a Gitpod workspace with your Pull Request
 1. Using the provided script, build the combo you want to test
+
     ```bash
     ./build-combo.sh full # replace "full" with your combo's name from dazzle.yaml
     ```
+
 1. Pull the image locally
+
     ```bash
     docker pull localhost:5000/dazzle:full # again, replace "full" here
     ```
+
 1. Create a testing directory where you'll test your repo (e.g. `test/`)
 1. Create a `.gitpod.yml` and a corresponding `gitpod.Dockerfile`:
+
     ```yml
     # test/.gitpod.yml
     image:
         file: gitpod.Dockerfile
     ```
+
     ```Dockerfile
     # test/gitpod.Dockerfile
-    FROM localhost:5000/dazzle:full # replace "full" with your own 
+    FROM localhost:5000/dazzle:full # replace "full" with your own
     # ... optionally, more steps here
-1. Now you can test using [`gp validate`](https://www.gitpod.io/docs/references/gitpod-cli#validate). This will open a debug workspace where you can try out your changes:
+    ```
+
+1. Now you can test using [`gp validate`](https://www.gitpod.io/docs/references/gitpod-cli#validate).
+This will open a debug workspace where you can try out your changes:
+
     ```bash
     gp validate --workspace-folder="/workspace/workspace-images/test"
     ```
 
-If you want to change something and re-test, you will want to do steps 1,2 and 6 again. 
+If you want to change something and re-test, you will want to do steps 1,2 and 6 again.