Define required permissions for pre-release workflow

Signed-off-by: Kyle Harding <kyle@balena.io>

.github/workflows/create-pre-release.yml

@@ -26,11 +26,15 @@ on:
           - rc
           - snapshot
         required: false
-     
+
 env:
   REGISTRY: ghcr.io
   IMAGE_NAME: ${{ github.repository }}
 
+permissions:
+  contents: write
+  packages: write
+
 jobs:
   build:
     if: ${{ github.actor != 'dependabot'}}
@@ -48,7 +52,7 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: Log in to the Container registry
-        uses: docker/login-action@v3 
+        uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
@@ -71,7 +75,7 @@ jobs:
           sleep 10
           curl http://localhost:3000
       - run: echo "${{ github.ref }}"
-      - name: Tag a final release 
+      - name: Tag a final release
         id: prerelease
         uses: actionsdesk/semver@0.6.0-rc.10
         with: