Remove --no-cache from docker build to cache Whisper model

Docker layer caching will now preserve the Whisper model download step,
avoiding 1.5GB download on every deployment.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitea/workflows/deploy.yaml

@@ -27,7 +27,7 @@ jobs:
             git reset --hard origin/main
 
             echo "=== Rebuilding Docker containers ==="
-            docker compose build --no-cache
+            docker compose build
 
             echo "=== Restarting containers ==="
             docker compose down

deploy.sh

@@ -27,7 +27,7 @@ log "Git pull completed"
 
 # Rebuild and restart containers
 log "Rebuilding Docker containers..."
-docker compose -f "$COMPOSE_FILE" build --no-cache
+docker compose -f "$COMPOSE_FILE" build
 
 log "Restarting containers..."
 docker compose -f "$COMPOSE_FILE" down