add forgejo actions

.forgejo/workflows/build.yaml

@@ -0,0 +1,21 @@
+on: [push]
+
+concurrency:
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: docker
+    container:
+      image: archlinux:base-devel
+    steps:
+      - uses: https://git.cgj.es/archpkgs/actions/build-pkg@v1
+        name: build-pkg@v1
+  publish:
+    needs: [build]
+    runs-on: docker
+    steps:
+      - uses: https://git.cgj.es/archpkgs/actions/publish-pkg@v1
+        name: publish-pkg@v1
+        with:
+          PKG_TOKEN: ${{ secrets.PKG_TOKEN }}