Fix: add node-gpy to fix arm64 builds (#1616)

## Summary

- Add `node-gyp` to `apk add` in `ui/Dockerfile` and `python/Dockerfile`
— npm 11 on arm64 Wolfi no longer bundles it, causing `npm ci`/`npm
install` to fail with `Cannot find module 'node-gyp/bin/node-gyp.js'`

## Root cause

`ui/Dockerfile` uses `FROM --platform=$BUILDPLATFORM`, so the deps stage
runs natively on the build host. On Apple Silicon (arm64), Wolfi's
`nodejs~24` ships with npm 11, which no longer bundles `node-gyp` but
still requires it internally. This only affects arm64 builds — GitHub CI
runs on amd64 where the Wolfi nodejs package ships with npm 10.

## Testing

Deployed via `make helm-install` on Apple Silicon and verified that e2e
tests pass.

Signed-off-by: Jeremy Alvis <jeremy.alvis@solo.io>

Author: iplay88keys

python/Dockerfile

@@ -62,7 +62,7 @@ RUN addgroup -g 1001 pythongroup                           && \
 # Install anthropic sandbox runtime and dependencies
 RUN --mount=type=cache,target=/var/cache/apk,rw \
     apk add \
-    nodejs npm bubblewrap socat ripgrep
+    nodejs npm node-gyp bubblewrap socat ripgrep
 
 # Install sandbox runtime from a specific commit of the GitHub repo without using global prefix
 # This avoids scope-related rename issues in global node_modules

ui/Dockerfile

@@ -10,7 +10,7 @@ ARG BUILDPLATFORM
 ARG TOOLS_NODE_VERSION
 
 RUN echo "Installing on $BUILDPLATFORM" \
-    && apk add --no-cache curl bash openssl unzip ca-certificates nginx supervisor "nodejs~${TOOLS_NODE_VERSION}" npm \
+    && apk add --no-cache curl bash openssl unzip ca-certificates nginx supervisor "nodejs~${TOOLS_NODE_VERSION}" npm node-gyp \
     && update-ca-certificates
 
 ENV DO_NOT_TRACK=1