Add devbox image Dockerfiles and build scripts, split from homelab-komodo

devbox/flutter-vnc/Dockerfile

@@ -0,0 +1,38 @@
+FROM coder-devbox-flutter:latest AS base-default
+
+USER root
+
+# Same XFCE4 + TigerVNC + noVNC stack as devbox/vnc, layered on top of the
+# already-built Flutter image instead of base-config directly — reuses the
+# Flutter/fvm layer's build cache entirely rather than reinstalling it.
+RUN DEBIAN_FRONTEND=noninteractive apt-get update -qq \
+    && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+       xfce4 xfce4-terminal dbus-x11 \
+       tigervnc-standalone-server tigervnc-common \
+       novnc websockify \
+       fonts-dejavu-core \
+       x11vnc \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+# x11vnc is installed only for its `storepasswd` tool — see devbox/vnc's
+# Dockerfile for why (no vncpasswd equivalent in this Ubuntu package split).
+# x11vnc itself is never run.
+
+# Flutter's own Linux desktop build requirements (per Flutter's official
+# docs) — needed so `flutter run -d linux` / `flutter build linux` actually
+# work inside this workspace, with the VNC desktop providing a real display
+# for the resulting GUI app to run against instead of Xvfb-style headless
+# testing.
+RUN DEBIAN_FRONTEND=noninteractive apt-get update -qq \
+    && DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+       clang cmake ninja-build pkg-config libgtk-3-dev liblzma-dev libstdc++-12-dev \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+# Lives outside /home/coder — see vnc-startup.sh header comment.
+COPY ./vnc-startup.sh /usr/local/bin/vnc-startup.sh
+RUN chmod +x /usr/local/bin/vnc-startup.sh
+
+USER coder
+
+RUN flutter config --enable-linux-desktop