ci: migrate from ghcr.io to Gitea registry

- Update REGISTRY env var from ghcr.io to git.farh.net
- Remove credentials blocks from postgres/redis service containers
- Update login step condition from main-only to all push events
- Use GITEA_TOKEN instead of GITHUB_TOKEN for registry auth
- Update deploy-dev and deploy-uat kustomize image references
- Rename login step to Gitea Container Registry

Fixes CAR-995

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

.gitea/workflows/ci.yml

@@ -15,7 +15,7 @@ permissions:
   packages: write
 
 env:
-  REGISTRY: ghcr.io
+  REGISTRY: git.farh.net
   IMAGE_NAME: cartsnitch/api
 
 jobs:
@@ -53,9 +53,6 @@ jobs:
     services:
       postgres:
         image: postgres:15-alpine
-        credentials:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
         env:
           POSTGRES_USER: cartsnitch
           POSTGRES_PASSWORD: cartsnitch_test
@@ -69,9 +66,6 @@ jobs:
           --health-retries 5
       redis:
         image: redis:7-alpine
-        credentials:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
         ports:
           - 6379:6379
         options: >-
@@ -129,13 +123,13 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
-      - name: Log in to GHCR
-        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+      - name: Log in to Gitea Container Registry
+        if: github.event_name == 'push'
         uses: docker/login-action@v3
         with:
           registry: ${{ env.REGISTRY }}
           username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          password: ${{ secrets.GITEA_TOKEN }}
 
       - name: Extract metadata
         id: meta
@@ -225,7 +219,7 @@ jobs:
         if: needs.build-and-push.result == 'success'
         run: |
           cd infra/apps/overlays/dev
-          kustomize edit set image ghcr.io/cartsnitch/api:${{ steps.api_tag.outputs.tag }}
+          kustomize edit set image git.farh.net/cartsnitch/api:${{ steps.api_tag.outputs.tag }}
 
       - name: Commit and push to infra
         run: |
@@ -269,7 +263,7 @@ jobs:
         if: needs.build-and-push.result == 'success'
         run: |
           cd infra/apps/overlays/uat
-          kustomize edit set image ghcr.io/cartsnitch/api:${{ steps.api_tag.outputs.tag }}
+          kustomize edit set image git.farh.net/cartsnitch/api:${{ steps.api_tag.outputs.tag }}
 
       - name: Commit and push to infra
         run: |