Try writing a CI build

.github/workflows/build.yml

@@ -0,0 +1,68 @@
+# This workflow will run tests using node and then publish a package to GitHub Packages when a release is created
+# For more information see: https://docs.github.com/en/actions/publishing-packages/publishing-nodejs-packages
+
+name: Build box2d3-wasm
+
+on:
+  # release:
+  #   types: [created]
+  workflow_dispatch:
+
+env:
+  EM_VERSION: 3.1.73
+  EM_CACHE_FOLDER: 'emsdk-cache'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+      - name: Setup cache
+        id: cache-system-libraries
+        uses: actions/cache@v4
+        with:
+          path: ${{env.EM_CACHE_FOLDER}}
+          key: ${{env.EM_VERSION}}-${{ runner.os }}
+      - uses: mymindstorm/setup-emsdk@v14
+        with:
+          version: ${{env.EM_VERSION}}
+          actions-cache-folder: ${{env.EM_CACHE_FOLDER}}
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+      - name: install global deps
+        run: npm i -g typescript yarn
+      - name: build makefile
+        working-directory: box2d3-wasm
+        run: shell/0_build_makefile.sh
+        env:
+          FLAVOUR: simd
+          TARGET_TYPE: Debug
+      - name: emmake
+        working-directory: box2d3-wasm
+        run: emmake make -j8 -C cmake-build
+      - name: build wasm
+        working-directory: box2d3-wasm
+        run: shell/1_build_wasm.sh
+        env:
+          FLAVOUR: simd
+          TARGET_TYPE: Debug
+
+  # publish-gpr:
+  #   needs: build
+  #   runs-on: ubuntu-latest
+  #   permissions:
+  #     contents: read
+  #     packages: write
+  #   steps:
+  #     - uses: actions/checkout@v4
+  #     - uses: actions/setup-node@v4
+  #       with:
+  #         node-version: 20
+  #         registry-url: https://npm.pkg.github.com/
+  #     - run: npm ci
+  #     - run: npm publish
+  #       env:
+  #         NODE_AUTH_TOKEN: ${{secrets.GITHUB_TOKEN}}