fix(docker): use build:ci script in Dockerfiles

Docker builds were using 'bun run build' which requires .env.production
file via dotenv. This file isn't copied into Docker context.

Changed to 'bun run build:ci' which uses env vars from ARG/ENV directly,
matching how the CI workflow builds.

Author: HMarzban

packages/admin-dashboard/docker/Dockerfile.bun

@@ -49,7 +49,8 @@ COPY packages/admin-dashboard ./packages/admin-dashboard
 COPY tsconfig.json ./
 
 WORKDIR /app/packages/admin-dashboard
-RUN bun run build
+# Use build:ci (no dotenv dependency - env vars already set via ARG/ENV)
+RUN bun run build:ci
 
 # ============================================================================
 # Stage 4: Runner

packages/webapp/docker/Dockerfile.bun

@@ -122,8 +122,9 @@ COPY .prettierrc.json ./
 COPY tsconfig.json ./
 
 # Build Next.js app (standalone output configured in next.config.js)
+# Use build:ci (no dotenv dependency - env vars already set via ARG/ENV)
 WORKDIR /app/packages/webapp
-RUN bun run build
+RUN bun run build:ci
 
 # ============================================================================
 # Stage 5: Runner - Production runtime