add nodejs 22

Dockerfile.node22-linux

@@ -0,0 +1,40 @@
+# Electron Linux build image (Node 20) on Debian slim
+FROM debian:bookworm-slim
+
+LABEL org.opencontainers.image.title="electron-builder-linux (Node 22)"
+LABEL org.opencontainers.image.description="Container for building Linux Electron apps (AppImage, deb, rpm) using electron-builder (Node 20)"
+LABEL maintainer="me@johanneskr.de"
+
+ENV DEBIAN_FRONTEND=noninteractive \
+    NPM_CONFIG_LOGLEVEL=warn
+
+# 1) Basis & Node 20 via NodeSource
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ca-certificates curl gnupg2 dirmngr \
+ && rm -rf /var/lib/apt/lists/*
+
+RUN curl -fsSL https://deb.nodesource.com/setup_22.x | bash - \
+ && apt-get update && apt-get install -y --no-install-recommends nodejs \
+ && corepack enable \
+ && rm -rf /var/lib/apt/lists/*
+
+# 2) Build- & Packaging-Deps (für electron-builder Linux Targets)
+#    - AppImage benötigt FUSE -> libfuse2
+#    - deb: dpkg, fakeroot
+#    - rpm: rpm
+#    - native modules: build-essential, python3, pkg-config, libudev-dev, libusb-1.0-0-dev, libsecret-1-dev
+#    - optional runtime libs für Tests/Headless-Runs
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential python3 git file xz-utils zip p7zip-full fakeroot \
+    dpkg rpm libarchive-tools \
+    libfuse2 \
+    pkg-config libudev-dev libusb-1.0-0-dev libsecret-1-dev \
+    xvfb fontconfig \
+    libx11-xcb1 libxss1 libasound2 libnss3 libgtk-3-0 libatk-bridge2.0-0 libgbm1 libxkbcommon0 libdrm2 \
+ && rm -rf /var/lib/apt/lists/*
+
+# (Optional) Sanity-Check
+RUN node -v && npm -v && npx --yes electron-builder --version || true
+
+WORKDIR /workspace
+CMD ["bash"]