chore: update the "prettier" process to take into account only certain file types

Author: ftonato

.github/workflows/deploy.yml

@@ -22,10 +22,16 @@ jobs:
         uses: actions/checkout@v2
         with:
           # Make sure the actual branch is checked out when running on pull requests
-          ref: ${{ github.head_ref }}
+          ref: ${{ github.event.pull_request.base.ref }}
+
+          # This is important to fetch the changes to the previous commit
+          fetch-depth: 0
 
       - name: Prettify code
         uses: creyD/[email protected]
+        with:
+          prettier_options: --write src/**/*.{js,json,md}
+          only_changed: True
   build:
     # The type of runner that the job will run on
     if: github.event_name != 'pull_request'