conf(github): add dependabot and mergify PE-37038

.github/dependabot.yml

@@ -0,0 +1,25 @@
+# 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/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: 'npm'
+    directory: '/'
+    schedule:
+      interval: weekly
+      time: '10:00'
+      timezone: America/New_York
+    groups:
+      prettier:
+        patterns:
+          - prettier
+          - eslint-plugin-prettier
+
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      interval: weekly
+      time: '10:00'
+      timezone: America/New_York

.github/mergify.yml

@@ -0,0 +1,10 @@
+pull_request_rules:
+  - name: automatic merge for Dependabot pull requests
+    conditions:
+      - author=dependabot[bot]
+      - check-success=build
+      - check-success=commitlint
+      - 'title~=^build\(deps-dev\): bump '
+    actions:
+      merge:
+        method: squash