Use payload.pr_number

Author: chessbyte

.github/workflows/deploy.yaml

@@ -12,7 +12,7 @@ jobs:
       PAYLOAD_REF: ${{ github.event.client_payload.ref }}
       PAYLOAD_SHA: ${{ github.event.client_payload.sha }}
       PAYLOAD_REPOSITORY: ${{ github.event.client_payload.repository }}
-      PAYLOAD_COMMIT_MESSAGE: ${{ github.event.client_payload.commit_message }}
+      PAYLOAD_PR_NUMBER: ${{ github.event.client_payload.pr_number }}
     steps:
       - uses: actions/checkout@v2
       - name: Set up Ruby

parse_commit_message.rb

@@ -1,7 +1,7 @@
 #!/usr/bin/env ruby
 
 message =
-  if ENV["PAYLOAD_COMMIT_MESSAGE"].to_s =~ /\AMerge pull request (#\d+)/
+  if ENV["PAYLOAD_PR_NUMBER"].to_s =~ /^(\d+)$/
     "#{ENV["PAYLOAD_REPOSITORY"]}#{\$1}"
   else
     "#{ENV["PAYLOAD_REPOSITORY"]}@#{ENV["PAYLOAD_SHA"]} (#{ENV["PAYLOAD_REF"]})"