Migrate actions to forgejo

.forgejo/workflows/build.yml

@@ -0,0 +1,30 @@
+name: Build project
+
+on: [push, workflow_dispatch]
+
+jobs:
+  build:
+    runs-on: node-bookworm
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: 'recursive'
+
+      - name: Install dependencies
+        run: |
+          apt update
+          apt install -y gcc gcc-multilib g++ g++-multilib clang \
+            python3 pipx python3-pip python3-setuptools python3-wheel ninja-build
+          pipx install meson
+          pipx ensurepath
+
+      - name: Build
+        run: ./build-matrix.sh
+
+      - name: Upload binaries
+        uses: forgejo/upload-artifact@v4
+        with:
+          name: binaries_${{github.sha}}.zip
+          path: ${{ github.workspace }}/hl2sdk-starter/bin/*.so
+