Add release branches to ci

Closes #2194

Author: ppfeister

.github/workflows/regression.yml

@@ -2,15 +2,19 @@ name: Regression Testing
 
 on:
   pull_request:
-    branches: [ master ]
+    branches:
+      - master
+      - release/**
     paths:
       - '.github/workflows/regression.yml'
       - '**/*.json'
       - '**/*.py'
       - '**/*.ini'
       - '**/*.toml'
   push:
-    branches: [ master ]
+    branches:
+      - master
+      - release/**
     paths:
       - '.github/workflows/regression.yml'
       - '**/*.json'