fix(ci): install bash in the Docker build stage

The build script now runs every heavy command through
scripts/with-memory-cap.sh, which is bash (arrays, BASH_REMATCH). Alpine's
node image ships busybox ash, not bash, so the builder stage failed with
`sh: bash: not found` (exit 127): ci-deploy.sh could not build the image.

Verified: full docker build passes and compiles all 279 routes.

Dockerfile

@@ -3,9 +3,11 @@ FROM node:26.10.0-alpine AS migrations
 WORKDIR /app
 ENV NEXT_TELEMETRY_DISABLED=1
 
-# Installeer git en pnpm v12
+# Installeer git, bash en pnpm v12. bash is nodig voor
+# scripts/with-memory-cap.sh (gebruikt bashisme zoals arrays en BASH_REMATCH);
+# Alpine levert geen bash mee.
 RUN --mount=type=cache,target=/var/cache/apk \
-    apk add --no-cache git \
+    apk add --no-cache git bash \
     && npm install -g [email protected]
 
 # Stel het PATH zo in dat Alpine pnpm gegarandeerd overal herkent