switch from dockerhub to ghcr, improve docker caching (#2695)

## Description:

Switch to GHCR for faster pulls/pushes and increased rate limits
Use cache-builder driver for better caching, so npm ci is cached if
dependencies don't change.



## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

evan

.github/workflows/deploy.yml

@@ -84,11 +84,12 @@ jobs:
           token: ${{ steps.generate-token.outputs.token }}
           environment-url: https://${{ env.FQDN }}
           environment: ${{ inputs.target_domain == 'openfront.io' && 'prod' || 'staging' }}
-      - name: 🔗 Log in to Docker Hub
+      - name: 🔗 Log in to GHCR
         uses: docker/login-action@v3
         with:
-          username: ${{ vars.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          registry: ghcr.io
+          username: ${{ vars.GHCR_USERNAME }}
+          password: ${{ secrets.GHCR_TOKEN }}
       - name: 🔑 Create SSH private key
         env:
           SERVER_HOST_MASTERS: ${{ secrets.SERVER_HOST_MASTERS }}
@@ -108,8 +109,8 @@ jobs:
           ADMIN_TOKEN: ${{ secrets.ADMIN_TOKEN }}
           CF_ACCOUNT_ID: ${{ secrets.CF_ACCOUNT_ID }}
           CF_API_TOKEN: ${{ secrets.CF_API_TOKEN }}
-          DOCKER_REPO: ${{ vars.DOCKERHUB_REPO }}
-          DOCKER_USERNAME: ${{ vars.DOCKERHUB_USERNAME }}
+          GHCR_REPO: ${{ vars.GHCR_REPO }}
+          GHCR_USERNAME: ${{ vars.GHCR_USERNAME }}
           ENV: ${{ inputs.target_domain == 'openfront.io' && 'prod' || 'staging' }}
           HOST: ${{ github.event_name == 'workflow_dispatch' && inputs.target_host || 'staging' }}
           OTEL_ENDPOINT: ${{ secrets.OTEL_ENDPOINT }}