Use debian bullseye for build

See: #506 & #512

Author: laverdet

Dockerfile.debian

@@ -1,12 +1,12 @@
-FROM node:22-bookworm-slim AS build
+FROM node:22-bullseye-slim AS build
 WORKDIR /isolated-vm
 RUN apt-get update && \
   apt-get install -y --no-install-recommends \
-  g++-11 \
+  g++ \
   make \
   python3
 COPY . .
 RUN npm install --ignore-scripts
-RUN CXX=g++-11 MAKEFLAGS=-j$(nproc) npx -y prebuild
+RUN MAKEFLAGS=-j$(nproc) npx -y prebuild
 FROM scratch
 COPY --from=build /isolated-vm/prebuilds .