chore: tools (skip-mev#8)

* mergify

* dependabot

Author: Alex Johnson

.github/dependabot.yml

@@ -0,0 +1,27 @@
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: "/"
+    schedule:
+      interval: weekly
+
+  - package-ecosystem: gomod
+    directory: "/"
+    schedule:
+      interval: weekly
+    labels:
+      - dependencies
+    open-pull-requests-limit: 3
+    target-branch: "sdk-v50"
+
+  - package-ecosystem: gomod
+    directory: "/"
+    schedule:
+      interval: weekly
+    labels:
+      - dependencies
+    open-pull-requests-limit: 3
+    target-branch: "sdk-47"

.mergify.yml

@@ -0,0 +1,14 @@
+queue_rules:
+  - name: default
+    conditions:
+      - "#approved-reviews-by>1"
+
+pull_request_rules:
+  - name: backport patches to sdk-47 branch
+    conditions:
+      - base=sdk-v50
+      - label=backport
+    actions:
+      backport:
+        branches:
+          - sdk-47