GitHub Action for Slack Incoming Webhook

Feature

Send a message using Incoming Webhooks on Slack App
- Don't use legacy incoming Webhooks on custom integrations
You can use the names of the fields in the Message payloads provided by Slack
- https://api.slack.com/reference/messaging/payload

Simple Usage

- name: Slack Notification
  uses: tokorom/action-slack-incoming-webhook@main
  env:
    INCOMING_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
  with:
    text: Hello, Slack!

Here's what the Slack message would look like:

Advanced Usages

You can flexibly specify attachments and blocks
- https://api.slack.com/reference/messaging/attachments
- https://api.slack.com/reference/block-kit/blocks

- name: Set COMMIT_MESSAGE
    run: echo "COMMIT_MESSAGE=${{ github.event.head_commit.message }}" | tr '\n' ' ' >> $GITHUB_ENV
- name: Slack Notification on SUCCESS
  if: success()
  uses: tokorom/action-slack-incoming-webhook@main
  env:
    INCOMING_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
  with:
    text: Successfully automated deployment.
    attachments: |
      [
        {
          "color": "good",
          "author_name": "${{ github.actor }}",
          "author_icon": "${{ github.event.sender.avatar_url }}",
          "fields": [
            {
              "title": "Commit Message",
              "value": "${{ github.event.head_commit.message }}"
            },
            {
              "title": "GitHub Actions URL",
              "value": "${{ github.event.repository.url }}/actions/runs/${{ github.run_id }}"
            },
            {
              "title": "Compare URL",
              "value": "${{ github.event.compare }}"
            }
          ]
        }
      ]

Here's what the Slack message would look like:

Change the icon

You can change the icon for a Slack message in the Slack App settings.

Slack's new Incoming Webhooks do not allow API payloads to override the icon.

Open Your Apps page
Select your app for Incoming Webhooks
Select Basic Information > Display Information
Set any icon you like!