Enable dependabot

.github/dependabot.yml

@@ -0,0 +1,26 @@
+# https://github.com/pixiebrix/eslint-config-pixiebrix/network/updates
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: weekly
+      day: sunday
+      time: "08:42"
+      timezone: Etc/UTC
+    versioning-strategy: increase # Update package.json too https://stackoverflow.com/a/66819358/288906
+    open-pull-requests-limit: 20
+    reviewers:
+      - fregante
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+      day: sunday
+      time: "08:42"
+      timezone: Etc/UTC
+    open-pull-requests-limit: 20
+    reviewers:
+      - fregante