chore: add .gitea CI/CD workflows

.gitea/workflows/ci.yml

@@ -0,0 +1,36 @@
+name: CI
+
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    env:
+      # temporary: proxy required due to firewall blocks
+      HTTP_PROXY: http://192.168.100.2:10808
+      HTTPS_PROXY: http://192.168.100.2:10808
+    steps:
+      - name: Install system dependencies (Node.js, Git)
+        run: |
+          apt-get update
+          apt-get install -y nodejs git ca-certificates
+
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.26"
+
+      - name: Check formatting
+        run: test -z "$(gofmt -d .)" || exit 1
+
+      - name: Vet
+        run: go vet ./...
+
+      - name: Build
+        run: go build ./...
+
+      - name: Test
+        run: go test ./...