Add simple CI

.github/workflows/check.yml

@@ -0,0 +1,25 @@
+name: Check
+
+on:
+  pull_request:
+  push:
+    branches: [master]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        zeek_version:
+          - zeek-lts
+          - zeek
+
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+    - uses: zeek/action-zkg-install@v2
+      with:
+        zeek_version: ${{ matrix.zeek_version }}