fix(docs): docker

Author: Flo0806

packages/docs/.dockerignore

@@ -0,0 +1,3 @@
+node_modules
+.vitepress/dist
+.vitepress/cache

packages/docs/Dockerfile

@@ -2,11 +2,17 @@
 FROM node:22-bookworm-slim AS builder
 
 RUN apt-get update && apt-get upgrade -y
-RUN npm install -g pnpm
+# Pinned: an unpinned pnpm silently follows major releases
+RUN npm install -g pnpm@11.22.0
 
 WORKDIR /app
 
 COPY package.json ./
+
+# esbuild needs its postinstall to fetch the binary. pnpm 11 fails on ignored
+# build scripts instead of warning like pnpm 10 did, and the repo's allowBuilds
+# lives in the root pnpm-workspace.yaml, which is outside this build context.
+RUN printf 'allowBuilds:\n  esbuild: true\n' > pnpm-workspace.yaml
 RUN pnpm install
 
 COPY . .