Add slack notification step for nightly run failures

[thepetk]

What does this PR do?

This PR adds an extra step in the check_registry.yaml workflow. In case of failure, it sends a message in a specific slack channel using a secret SLACK_WEBHOOK_URL.

The format of the message has been defined inside the related issue.

Which issue(s) does this PR fix

fixes devfile/api#1255

PR acceptance criteria

Testing and documentation do not need to be complete in order for this PR to be approved. We just need to ensure tracking issues are opened.

• Unit/Functional tests

• Documentation

How to test changes / Special notes to the reviewer

[thepetk]

WIP: As we should create two secrets for this alizer:

1. SLACK_NOTIFICATIONS_TOKEN
2. SLACK_CHANNEL_ID

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (80061c4) 73.16% compared to head (10fb309) 73.16%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #43   +/-   ##
=======================================
  Coverage   73.16%   73.16%           
=======================================
  Files          11       11           
  Lines        1565     1565           
=======================================
  Hits         1145     1145           
  Misses        351      351           
  Partials       69       69           

☔ View full report in Codecov by Sentry.
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[thepetk]

WIP: As we should create two secrets for this alizer:

1. SLACK_NOTIFICATIONS_TOKEN
2. SLACK_CHANNEL_ID

/hold as the secrets will have to be created before merging the PR

[thepetk]

WIP: As we should create two secrets for this alizer:

1. SLACK_NOTIFICATIONS_TOKEN
2. SLACK_CHANNEL_ID

/hold as the secrets will have to be created before merging the PR

Both secrets are now created. Removing the WIP label.

[michael-valdron]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: michael-valdron, thepetk

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