msbuild: add script to generate nuget dependencies

pkgs/development/tools/build-managers/msbuild/create-deps.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p msbuild
+set -euo pipefail
+
+cat << EOL
+{ fetchurl }: [
+EOL
+
+tmpdir="$(mktemp -d -p "$(pwd)")" # must be under source root
+trap 'rm -rf $tmpdir' EXIT
+
+(
+    ulimit -n 8192 # https://github.com/NuGet/Home/issues/8571
+    export HOME="$tmpdir"
+    msbuild -noAutoRsp -t:restore -p:RestoreNoCache=true MSBuild.sln
+    msbuild -noAutoRsp -t:restore -p:RestoreNoCache=true "$tmpdir"/.nuget/packages/microsoft.dotnet.arcade.sdk/*/tools/Tools.proj
+) | \
+    sed -nr 's/^ *OK *(.*\.nupkg).*$/\1/p' | \
+    sort -u | \
+    while read url; do
+        sha256=$(nix-prefetch-url "$url" 2>/dev/null)
+        cat << EOL
+  (fetchurl {
+    url = "$url";
+    sha256 = "$sha256";
+  })
+EOL
+    done
+
+cat << EOL
+]
+EOL