build paperweight in actions temporarily

.github/workflows/build.yml

@@ -22,6 +22,8 @@ jobs:
         uses: gradle/actions/setup-gradle@v4
       - name: Configure Git User Details
         run: git config --global user.email "actions@github.com" && git config --global user.name "Github Actions"
+      - name: build paperweight
+        run: ./build_paperweight.sh
       - name: Apply Patches
         run: ./gradlew applyAllPatches --stacktrace
       - name: Build

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "paperweight"]
+	path = paperweight
+	url = https://github.com/PaperMC/paperweight.git

build_paperweight.sh

@@ -0,0 +1,5 @@
+#!/bin/bash
+set -eou pipefail
+git submodule update --init --recursive
+cd paperweight
+./gradlew pTML