fix(CI): use Gitea registry for Docker push

Switch from ghcr.io (GitHub Container Registry) to git.farh.net
Gitea Container Registry. The Gitea Actions runner does not have
access to GitHub's GITHUB_TOKEN for ghcr.io authentication.

Based on fix/ci-registry-auth branch pattern (a582bd0).

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.github/workflows/ci.yml

@@ -62,10 +62,6 @@ jobs:
     name: Build & Push Docker Image
     runs-on: ubuntu-latest
     needs: [lint-typecheck, test]
-    permissions:
-      contents: read
-      packages: write
-      id-token: write
     steps:
       - uses: actions/checkout@v4
 
@@ -83,12 +79,12 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
-      - name: Log in to GitHub Container Registry
+      - name: Log in to Gitea Container Registry
         uses: docker/login-action@v3
         with:
-          registry: ghcr.io
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          registry: git.farh.net
+          username: ${{ gitea.actor }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
 
       - name: Build and push Web image
         uses: docker/build-push-action@v6
@@ -97,7 +93,7 @@ jobs:
           file: Dockerfile
           push: true
           tags: |
-            ghcr.io/groombook/web:${{ steps.version.outputs.tag }}
-            ${{ github.ref == 'refs/heads/main' && 'ghcr.io/groombook/web:latest' || '' }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
+            git.farh.net/groombook/web:${{ steps.version.outputs.tag }}
+            ${{ github.ref == 'refs/heads/main' && 'git.farh.net/groombook/web:latest' || '' }}
+          cache-from: type=registry,ref=git.farh.net/groombook/cache:web
+          cache-to: type=registry,ref=git.farh.net/groombook/cache:web,mode=max