Dependabot and Fork Sync (ethereum-optimism#93)

* .github: add sync fork workflow and update dependabot to only check .github and go.mod

* .github: update dependabot.yml

.github/dependabot.yml

@@ -1,7 +1,8 @@
 version: 2
 updates:
+  # Check for updates on our docker image and for celestia-node
   - package-ecosystem: docker
-    directory: "/ops/docker"
+    directory: "/ops-bedrock"
     schedule:
       interval: daily
     open-pull-requests-limit: 10
@@ -14,18 +15,11 @@ updates:
     open-pull-requests-limit: 10
     labels:
       - dependencies
-  - package-ecosystem: npm
-    directory: "/"
-    schedule:
-      interval: daily
-    open-pull-requests-limit: 10
-    labels:
-      - dependencies
+  # Check for updates on celestia packages
   - package-ecosystem: gomod
     directory: "/"
     schedule:
       interval: daily
     open-pull-requests-limit: 10
     labels:
-      - automerge
       - dependencies

.github/workflows/fork-sync.yml

@@ -0,0 +1,18 @@
+name: Sync Fork
+
+on:
+  schedule:
+    - cron: '*/30 * * * *' # every 30 minutes
+  workflow_dispatch: # on button click
+
+jobs:
+  sync:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: tgymnich/fork-sync@v1.8
+        with:
+          owner: llvm
+          base: celesita-develop
+          head: develop