fix(sandcastle): remove corepack prepare from Dockerfile

Align with the working Dockerfile from sap-ai-provider. The container
does not need explicit pnpm setup — corepack in node:24 handles it
on demand when pnpm is invoked.

diff --git a/.sandcastle/Dockerfile b/.sandcastle/Dockerfile
index 06efa17e081c39d4aad17569d70c624bbf44b23f..e7c4912845037b0c85c9a41dbccbf034121c78fb 100644 (file)
--- a/.sandcastle/Dockerfile
+++ b/.sandcastle/Dockerfile
@@ -21,8 +21,6 @@ RUN npm install -g \
     @mariozechner/pi-coding-agent \
     opencode-ai
 
-RUN corepack enable && corepack prepare pnpm@latest --activate
-
 # Rename the base image's "node" user to "agent" and align UID/GID.
 # Default 1001 matches GitHub Actions runner UID (ubuntu-latest since May 2025).
 # On macOS, build with --build-arg AGENT_UID=$(id -u) to match host UID.