Set new run conditions for building

.github/workflows/build.yaml

@@ -1,15 +1,9 @@
 name: build
 
 on:
-  pull_request:
+  workflow_run:
-    paths:
+    workflows: [PackageUpdate]
-      - "srcpkgs/**"
+    types: [completed]
-    types:
-      - opened
-      - reopened
-      - synchronize
-    branches:
-      - main
   push:
     paths:
       - "srcpkgs/**"
@@ -20,7 +14,7 @@ jobs:
   changedpkgs:
     name: Check package changes
     runs-on: ubuntu-latest
-    if: "!contains(github.event.pull_request.title, '[ci skip]') && !contains(github.event.pull_request.body, '[ci skip]')"
+    if: "${{ github.event.workflow_run.conclusion == 'success' }} && !contains(github.event.pull_request.title, '[ci skip]') && !contains(github.event.pull_request.body, '[ci skip]')"
 
     outputs:
       changed: ${{ steps.grabchanged.outputs.changed }}

.github/workflows/checksum.yaml

@@ -1,4 +1,4 @@
-name: update packages
+name: PackageUpdate
 
 on:
   pull_request: