Validate the complete container toolchain before release builds

scripts/build-avalonia-native-container.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+set -euo pipefail
+: "${RID:?RID is required}"
+: "${AVALONIA_VERSION:?AVALONIA_VERSION is required}"
+mkdir -p "$HOME"
+source_dir="/src/External/AvaloniaNative/.work/Avalonia-$AVALONIA_VERSION"
+git clone --depth 1 --branch "$AVALONIA_VERSION" https://github.com/AvaloniaUI/Avalonia.git "$source_dir"
+if git -C "$source_dir" config -f .gitmodules --get-regexp path | grep -q "[[:space:]]external/Numerge$"; then
+  git -C "$source_dir" submodule update --init --depth 1 external/Numerge
+fi
+python3 build/linux-toolchain/build-avalonia-native-cross.py \
+  --source "$source_dir" --rid "$RID" --sdk /opt/macos-sdk/MacOSX15.5.sdk \
+  --work "/src/External/AvaloniaNative/.work/zig-$AVALONIA_VERSION-$RID" \
+  --output "/src/External/AvaloniaNative/$RID/native"
+