Add CI for release branches (#63)

Author: sethvargo

.github/workflows/release.yml

@@ -4,6 +4,7 @@ on:
   push:
     branches:
       - 'main'
+      - 'release/**/*'
 
 jobs:
   release:

.github/workflows/unit.yml

@@ -3,10 +3,12 @@ name: 'Unit'
 on:
   push:
     branches:
-    - 'main'
+      - 'main'
+      - 'release/**/*'
   pull_request:
     branches:
-    - 'main'
+      - 'main'
+      - 'release/**/*'
   workflow_dispatch:
 
 concurrency: