ci: add initial CI build test

Adding initial test workflow for building the project.

.gitea/workflows/build.yaml

@@ -0,0 +1,15 @@
+name: build
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Run make
+        run: make