Add channel_id output parameter (#149)

action.yml

@@ -23,6 +23,8 @@ outputs:
     description: 'The timestamp on the message that was posted into Slack when using bot token'
   ts: # timestamp of message posted
     description: 'The timestamp on the message that was posted into Slack when using bot token'
+  channel_id: # Id of the channel. If channel name was used as input we can get ID from output for later use when updating message or posting to thread.
+    description: 'The channel id of the message that was posted into Slack when using bot token'
 runs:
   using: 'node16'
   main: 'dist/index.js'

src/slack-send.js

@@ -145,6 +145,8 @@ module.exports = async function slackSend(core) {
       // return the thread_ts if it exists, if not return the ts
       const thread_ts = webResponse.thread_ts ? webResponse.thread_ts : webResponse.ts;
       core.setOutput('thread_ts', thread_ts);
+      // return id of the channel from the response
+      core.setOutput('channel_id', webResponse.channel);
     }
 
     const time = (new Date()).toTimeString();