ci: Add basic pull request checker

We check style with my hacky style checker and also make sure the email
address of the author doesn't have noreply in it. Right now the style
checking is only the last 10 commits, which may include other people's
work.

Sponsored by:		Netflix

.github/workflows/prereq.yml

@@ -0,0 +1,34 @@
+---
+name: Quick Checker
+
+on:
+  push:
+    branches: [ 'ci-*' ]
+  pull_request:
+    branches: [ 'main' ]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 500
+      - name: Pull pain
+        run: git fetch --no-tags --no-recurse-submodules --depth=500 origin main
+      - name: Debug
+        run: |
+          echo $GITHUB_REF_NAME
+	  git rev-list -1 $GITHUB_REF_NAME
+	  git rev-list -1 origin/main
+      - name: Recent enough main?
+        run: git merge-base origin/main $GITHUB_REF_NAME
+      - name: Check Email
+        run:  sh ./tools/build/check-email.sh origin/main..$GITHUB_REF_NAME
+      - name: Check Style
+        run:  ./tools/build/checkstyle9.pl -color=always origin/main..$GITHUB_REF_NAME

tools/build/check-email.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+# Quick check to make sure all emails in the branch are good
+# Anything with noreply in the address
+
+bad=$(git log --pretty="%ae" "$@" | grep noreply) || exit 1
+if [ -n "${bad}" ] ; then
+    echo "Found the following bad email addresses: ${bad}"
+    exit 1
+fi
+exit 0