CI: run build-app.yml/build-toolbox.yml on PRs

Previously those workflows only ran on commits to master. Now they
run also on the PRs.

Author: avelanarius

.github/workflows/build-app.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - master
+  pull_request:
 
 permissions:
   contents: read

.github/workflows/build-toolbox.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - master
+  pull_request:
 
 permissions:
   contents: read