fix(ci): disable Docker build cache for API image

BuildKit cache on self-hosted runner was stale — compiled JS still had
bitnami/git:2 despite source using alpine/git:latest. Adding no-cache:
true to force clean rebuilds until we can investigate the cache
invalidation issue.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -100,6 +100,7 @@ jobs:
           context: .
           file: apps/api/Dockerfile
           push: true
+          no-cache: true
           tags: |
             ghcr.io/farhoodliquor/hightower-api:latest
             ghcr.io/farhoodliquor/hightower-api:sha-${{ github.sha }}