github actions: notifications on workflow failure

You may be looking for this: https://docs.github.com/en/actions/reference/context-and-expression-syntax-for-github-actions#job-status-check-functions

Specifically, if: ${{ failure() }}

you can try this in your actions

- name: Send mail
  if: failure()
  uses: dawidd6/action-send-mail@v2
  with:
    # mail server settings
    server_address: smtp.gmail.com
    server_port: 465
    # user credentials
    username: ${{ secrets.EMAIL_USERNAME }}
    password: ${{ secrets.EMAIL_PASSWORD }}
    # email subject
    subject: ${{ github.job }} job of ${{ github.repository }} has ${{ job.status }}
    # email body as text
    body: ${{ github.job }} job in worflow ${{ github.workflow }} of ${{ github.repository }} has ${{ job.status }}
    # comma-separated string, send email to
    to: abc@gmail.com,xyz@gmail.com
    # from email name
    from: XYZ