Merge pull request #8 from wihobbs/github-ci

.github: add commit validator

.github/workflows/main.yml

@@ -0,0 +1,17 @@
+on: [pull_request, push, merge_group]
+name: ci
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+jobs:
+  check-pr:
+    name: validate commits
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
+        fetch-depth: 0
+    - run: git fetch origin main
+    - uses: flux-framework/pr-validator@master