Add a check for missing swiftlint_version: key

[AliSoftware]

Add a check for missing swiftlint_version: key, so that if it's missing we exit gracefully instead of having docker run error complaining about invalid syntax

[Internal Ref]: This came up as part of p1736899091552619/1736896890.515319-slack-CC7L49W13

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• I have considered if this change warrants release notes and have added them to the appropriate section in the CHANGELOG.md if necessary.

[iangmaia]

👍

[ParaskP7]

👋 @AliSoftware , I am seeing that you are updating the README and CHANGELOG, I did the same as part of this new #138 PR of mine. Ah... this is now merged, I wasn't fast enough! 😅

PS: Apologies, but I wasn't aware about this README and CHANGELOG process before, #135 being my first PR and all.

[AliSoftware]

👋 @AliSoftware , I am seeing that you are updating the README and CHANGELOG, I did the same as part of this new #138 PR of mine. Ah... this is now merged, I wasn't fast enough! 😅

PS: I wasn't aware about this README and CHANGELOG process before.

The update of the CHANGELOG is documented in the PR's template (see checkbox).

The README update I did only because the plugin linter was complaining about it. Having to update that one regularly every time we do a new version is kinda annoying tbh (but Buildkite's official plugin linter job that we use to check this plugin checks for it so it's kinda forcing us to keep it in sync like that)

[ParaskP7]

The update of the CHANGELOG is documented in the PR's template (see checkbox).

Yea, apoligies for missing that, I kind of got used to just check these boxes without really paying close attention to them, working on multiple client/library projects that have a tons of them... 🤷 I should be careful with the tooling projects however, especially ones that I haven't contributed just yet... 😊

The README update I did only because the plugin linter was complaining about it.

Yea, I know, I got the same while working on #138 . 🫣

Having to update that one regularly every time we do a new version is kinda annoying tbh (but Buildkite's official plugin linter job that we use to check this plugin checks for it so it's kinda forcing us to keep it in sync like that)

Noted! 👍