Merge pull request #27 from ethereum-optimism/refcell/dependabot

feat: Dependabot Config

.github/dependabot.yml

@@ -0,0 +1,18 @@
+version: 2
+
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: daily
+  - package-ecosystem: cargo
+    directory: /
+    schedule:
+      interval: daily
+    ignore:
+      - dependency-name: "*"
+        # patch and minor updates don't matter for libraries
+        # remove this ignore rule if your package has binaries
+        update-types:
+          - "version-update:semver-patch"
+          - "version-update:semver-minor"