feat(image): add uv Python package manager and update entrypoint to support CMD

- Install uv from astral-sh/uv for Python package management
- Update entrypoint.sh to handle CMD argument and delegate to exec
- Set default CMD to "caddy" in Dockerfile
- Update task script to pull latest build image and set CI=true for pnpm install

image/entrypoint.sh

@@ -66,5 +66,12 @@ cat > /etc/caddy/Caddyfile <<EOF
 }
 EOF
 
-echo 'Start Caddy.'
-exec caddy run --config /etc/caddy/Caddyfile --adapter caddyfile
+case "$1" in
+    caddy)
+        echo 'Start Caddy.'
+        exec caddy run --config /etc/caddy/Caddyfile --adapter caddyfile 
+        ;;
+    *)
+        exec "$@"
+        ;;
+esac