ci: implement dependabot

Author: dhensby

.github/dependabot.yml

@@ -0,0 +1,29 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+  - package-ecosystem: "npm" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "weekly"
+    groups:
+      release-tools:
+        patterns:
+          - "@commitlint/*"
+          - "semantic-release"
+          - "@semantic-release/*"
+      test-tools:
+        patterns:
+          - "mocha"
+          - "nyc"
+          - "@istanbuljs/nyc-config-typescript"
+      action-tools:
+        patterns:
+          - "@actions/*"