[DEVOPS-1057] automated testing of yaml files

[cleverca22]

Description

this will automatically test that each yaml file to confirm it parses in haskell
currently, 2 non-parsing files are commented out pending comments from developers
and we need to find more yaml files and their matching types to add

Linked issue

Type of change

• 🐞 Bug fix (non-breaking change which fixes an issue)
• 🛠 New feature (non-breaking change which adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)
• 🏭 Refactoring that does not change existing functionality but does improve things like code readability, structure etc
• 🔨 New or improved tests for existing code
• ⛑ git-flow chore (backport, hotfix, etc)

Developer checklist

• I have read the style guide document, and my code follows the code style of this project.
• If my code deals with exceptions, it follows the guidelines.
• I have updated any documentation accordingly, if needed. Documentation changes can be reflected in opening a PR on cardanodocs.com, amending the inline Haddock comments, any relevant README file or one of the document listed in the docs directory.
• CHANGELOG entry has been added and is linked to the correct PR on GitHub.

Testing checklist

• I have added tests to cover my changes.
• All new and existing tests passed.

QA Steps

Screenshots (if available)

[365andreas]

This will fail because of:

cardano-sl/log-configs/template-demo.yaml

Lines 9 to 10 in 61a5221

	- {{file}}.pub
	- {{file}}

{{ and }} cause a:

testing: /nix/store/wvw52c9yb0009h8nd2cbh4g3mp0d9jda-template-demo.yaml yamlValidation: UnexpectedEvent {_received = Just (EventMappingStart Nothing), _expected = Nothing}

to be thrown.
Renaming {{file}} to tmpFileName will may do the job.

{{file}} is used in:

cardano-sl/scripts/common-functions.sh

Line 69 in 61a5221

sed "s|{{file}}|$log_file|g" "$template" > "$conf_file"