ci: enforce commit message standards with commitlint (#4)

.github/commitlint.config.js

@@ -0,0 +1,24 @@
+// Defined rules on commit messages; see the docs: https://commitlint.js.org/#/reference-rules
+
+const TypesArray = ["build", "chore", "ci", "docs", "feat", "fix", "perf", "refactor", "revert", "style", "test"];
+const SubjectsArray = ["upper-case", "pascal-case", "sentence-case", "start-case"];
+
+const Configuration = {
+  rules: {
+    "type-enum": [2, "always", TypesArray],
+    "type-case": [2, "always", "lower-case"],
+    "type-empty": [2, "never"],
+    "scope-case": [2, "always", "kebab-case"],
+    "subject-case": [2, "never", SubjectsArray],
+    "subject-empty": [2, "never"],
+    "subject-full-stop": [2, "never", "."],
+    "header-max-length": [2, "always", 80],
+    "body-case": [2, "always", "sentence-case"],
+    "body-leading-blank": [2, "always"],
+    "body-max-line-length": [2, "always", 100],
+    "footer-leading-blank": [2, "always"],
+    "footer-max-line-length": [2, "always", 100],
+  },
+};
+
+module.exports = Configuration;

.github/workflows/commitlint.yml

@@ -0,0 +1,23 @@
+name: Lint Commit Messages
+
+on: [pull_request]
+
+permissions:
+  contents: read
+  pull-requests: read
+
+jobs:
+  commitlint:
+    name: Commitlint
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Run commitlint
+        uses: wagoid/commitlint-github-action@v5
+        with:
+          configFile: .github/commitlint.config.js