perf(ci): only run workflows for specific branches

Author: andhreljaKern

.github/workflows/pi_build.yml

@@ -5,6 +5,9 @@ on:
 
   pull_request:
     types: [opened, synchronize, reopened]
+    branches:
+      - dev
+      - parent-image-updates
 
 permissions:
   id-token: write

.github/workflows/pi_merge.yml

@@ -5,6 +5,9 @@ on:
 
   pull_request:
     types: [closed]
+    branches:
+      - dev
+      - parent-image-updates
 
 permissions:
   id-token: write