slack-github-action | Send data into Slack using this GitHub Action | Chat library

Create a Slack workflow webhook.
Copy the webhook URL (https://hooks.slack.com/workflows/....) and add it as a secret in your repo settings named SLACK_WEBHOOK_URL.
Add a step to your GitHub action to send data to your Webhook.
Configure your Slack workflow to use variables from the incoming payload from the GitHub Action. You can select where you want to post the data and how you want to format it in Slack's worflow builder interface.
Create a Slack App for your workspace (alternatively use an existing app you have already created and installed).
Add the chat.write bot scope under OAuth & Permissions.
Install the app to your workspace.
Copy the app's Bot Token from the OAuth & Permissions page and add it as a secret in your repo settings named SLACK_BOT_TOKEN.
Invite the bot user into the channel you wish to post messages to (/invite @bot_user_name).
Create a Slack App for your workspace (alternatively use an existing app you have already created and installed).
Add the incoming-webhook bot scope under OAuth & Permissions.
Install the app to your workspace (you will select a channel to notify).
Activate and create a new webhook under Incoming Webhooks.
Copy the Webhook URL from the Webhook you just generated add it as a secret in your repo settings named SLACK_WEBHOOK_URL.