ci: update global workflows (#532)

.github/workflows/automerge.yml

@@ -13,9 +13,10 @@ on:
 
 jobs:
   autoapprove:
-    if: >
+    if: >-
       contains(fromJson('["LizardByte-bot"]'), github.event.pull_request.user.login) &&
-      contains(fromJson('["LizardByte-bot"]'), github.actor)
+      contains(fromJson('["LizardByte-bot"]'), github.actor) &&
+      startsWith(github.repository, 'LizardByte/')
     runs-on: ubuntu-latest
     steps:
       - name: Autoapproving
@@ -36,6 +37,7 @@ jobs:
             })
 
   automerge:
+    if: startsWith(github.repository, 'LizardByte/')
     needs: [autoapprove]
     runs-on: ubuntu-latest
     concurrency: