add kayma/ready-command

.github/workflows/default_slash_ops_command_help_callable.yml

@@ -1,5 +1,5 @@
 ---
-name: Execute ChatOps command
+name: Execute ChatOps help command
 
 # yamllint disable-line rule:truthy
 on:

.github/workflows/default_slash_ops_comment_dispatch_callable.yml

@@ -24,3 +24,4 @@ jobs:
           reactions: true
           commands: |
             help
+            ready

.github/workflows/default_welcome_message_callable.yml

@@ -23,6 +23,31 @@ jobs:
         with:
           # yamllint disable rule:line-length
           script: |
+            message = `Hey @${{ github.event.pull_request.user.login }}! 👋
+
+                       Thank you for your contribution to the project. Please refer to the [contribution rules](../blob/main/.github/CONTRIBUTING.md)
+                       for a quick overview of the process.
+
+                       Make sure that this PR clearly explains:
+
+                         - the problem being solved
+                         - the best way a reviewer and you can test your changes
+
+                       With submitting this PR you confirm that you hold the rights of the code added and agree that it will
+                       published under this [LICENSE](../blob/main/LICENSE).
+
+                       The following ChatOps commands are supported:
+                         - `/help`: notifies a maintainer to help you out
+                         - `/ready`: marks the PR as ready for review and removes the checklist
+
+                       Simply add a comment with the command in the first line. If you need to pass more information, separate it
+                       with a blank line from the command.
+
+                       _This message was generated automatically. You are welcome to [improve it](https://github.com/Hapag-Lloyd/Workflow-Templates/blob/main/.github/workflows/default_welcome_message_callable.yml)._`
+
+            // dedent the message
+            message = message.replace(/^ +/gm, '')
+
             // adds a comment to the PR (there is the issue API only which works work PRs too)
             github.rest.issues.createComment({
               issue_number: context.issue.number,