ci(github): add detector coverage workflow

.github/workflows/ci.yml

@@ -0,0 +1,52 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+
+jobs:
+  detector:
+    name: detector tests and lint (${{ matrix.os }})
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - ubuntu-latest
+          - macos-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.26"
+
+      - name: Install staticcheck
+        run: go install honnef.co/go/tools/cmd/staticcheck@latest
+
+      - name: Run detector tests
+        run: go test ./detector/...
+
+      - name: Run detector lint
+        run: $(go env GOPATH)/bin/staticcheck ./detector/...
+
+  full-darwin-build:
+    name: full repo tests and lint (darwin)
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.26"
+
+      - name: Install staticcheck
+        run: go install honnef.co/go/tools/cmd/staticcheck@latest
+
+      - name: Run all tests
+        run: go test ./...
+
+      - name: Run full lint
+        run: $(go env GOPATH)/bin/staticcheck ./...