ci: add Gitea Actions build/test workflow

.gitea/workflows/ci.yml

@@ -0,0 +1,50 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - '**.go'
+      - 'go.mod'
+      - 'go.sum'
+      - 'Makefile'
+      - '.gitea/workflows/ci.yml'
+  pull_request:
+    branches: [main]
+    paths:
+      - '**.go'
+      - 'go.mod'
+      - 'go.sum'
+      - 'Makefile'
+      - '.gitea/workflows/ci.yml'
+
+jobs:
+  build:
+    runs-on: cpu
+    timeout-minutes: 15
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.25'
+
+      - name: Format check
+        run: |
+          unformatted=$(find . -name '*.go' -not -path '*/testdata/*' -print0 | xargs -0 gofmt -l)
+          if [ -n "$unformatted" ]; then
+            echo "gofmt needs to run on:"
+            echo "$unformatted"
+            exit 1
+          fi
+
+      - name: Vet
+        run: go vet ./...
+
+      - name: Test
+        run: go test ./...
+
+      - name: Static build
+        run: CGO_ENABLED=0 go build -ldflags="-w -s" -o shush ./cmd/shush

.github/actionlint.yaml

@@ -0,0 +1,3 @@
+self-hosted-runner:
+  labels:
+    - cpu