increase timeout for full regression to 180 seconds. use 8 runners.

.github/workflows/full-regression.yml

@@ -2,6 +2,10 @@
 name: "Full Regression Test"
 
 on:
+  pull_request:
+    branches:
+      - develop
+
   push:
     branches:
       - develop
@@ -17,9 +21,9 @@ jobs:
     env:
       CCACHE_DIR: ${{ github.workspace }}/.ccache
     strategy:
-      max-parallel: 4
+      max-parallel: 8
       matrix:
-        idx: [ 0, 1, 2, 3 ]
+        idx: [ 0, 1, 2, 3, 4, 5, 6, 7 ]
 
     steps:
     - name: Checkout repository