Merge pull request #1042 from sul-dlss/cbeer-patch-1

Deploy the branch from the env variable

config/deploy.rb

@@ -3,7 +3,7 @@
 
 # Default branch is :master so we need to update to main
 if ENV['DEPLOY']
-  set :branch, 'main'
+  set :branch, ENV.fetch('BRANCH', 'main')
 else
   ask :branch, proc { `git rev-parse --abbrev-ref HEAD`.chomp }.call
 end