ci: ensure conventional commit styles are used for PRs

.github/workflows/lint-commits.yml

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+name: Lint Commit Messages
+on: [pull_request]
+
+jobs:
+  commitlint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - uses: wagoid/commitlint-github-action@v3

.husky/.gitignore

@@ -0,0 +1 @@
+_

.husky/commit-msg

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+#!/bin/sh
+. "$(dirname "$0")/_/husky.sh"
+
+npx --no-install commitlint --edit $1 --color
+

commitlint.config.js

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+module.exports = {
+  extends: ['@commitlint/config-conventional'],
+  helpUrl: "Confused? Try 'npm run-script commit'. For more info: https://github.com/conventional-changelog/commitlint/#what-is-commitlint"
+}