WIP: Add ignore_if_missing key to include in CI YML (#52680)
What does this MR do?
This is just a proposal since we need to decide on whether we think #52680 (moved) is a good idea. Also we may wish to use different keys for the syntax.
Allow include keyword to be a has with support for a new ignore_if_missing key. This will mean that if the file being included does not exist we will simply ignore and merge nothing (empty hash).
Support for local files only are implemented and support for a URL is deliberately left out due to the complexity of saying that the file on the other end of the URL does not exist (eg. intermittent network errors, what is the definition of missing?)
What are the relevant issue numbers?
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
Tests added for this feature/bug -
Conforms to the code review guidelines -
Conforms to the merge request performance guidelines -
Conforms to the style guides - [-] Conforms to the database guides