Add env variable for custom GitHub Actor

Signed-off-by: Riddhesh Sanghvi <[email protected]>

README.md

@@ -44,7 +44,8 @@ By default, action is designed to run with minimal configuration but you can alt
 Variable          | Default                                               | Purpose
 ------------------|-------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------
 SLACK_CHANNEL     | Set during Slack webhook creation                     | Specify Slack channel in which message needs to be sent
-SLACK_USERNAME    | `rtBot`                                               | The name of the sender of the message. Does not need to be a "real" username
+SLACK_USERNAME    | `rtBot`                                               | Custom Slack Username sending the message. Does not need to be a "real" username.
+SLACK_MSG_AUTHOR  | `$GITHUB_ACTOR` (The person who triggered action).    | GitHub username of the person who has triggered the action. In case you want to modify it, please specify corrent GitHub username.
 SLACK_ICON        | ![rtBot Avatar](https://github.com/rtBot.png?size=32) | User/Bot icon shown with Slack message. It uses the URL supplied to this env variable to display the icon in slack message.
 SLACK_ICON_EMOJI  | -                                                     | User/Bot icon shown with Slack message, in case you do not wish to add a URL for slack icon as above, you can set slack emoji in this env variable. Example value: `:bell:` or any other valid slack emoji.
 SLACK_COLOR       | `good` (green)                                        | You can pass an RGB value like `#efefef` which would change color on left side vertical line of Slack message.

main.sh

@@ -6,6 +6,7 @@ export SLACK_USERNAME=${SLACK_USERNAME:-"rtBot"}
 export CI_SCRIPT_OPTIONS="ci_script_options"
 export SLACK_TITLE=${SLACK_TITLE:-"Message"}
 export COMMIT_MESSAGE=$(cat "$GITHUB_EVENT_PATH" | jq -r '.commits[-1].message')
+export GITHUB_ACTOR=${SLACK_MSG_AUTHOR:-"$GITHUB_ACTOR"}
 
 hosts_file="$GITHUB_WORKSPACE/.github/hosts.yml"