Update cachix/cachix-action action to v15

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
cachix/cachix-action	action	major	v12 -> v15

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Release Notes

cachix/cachix-action (cachix/cachix-action)

v15: cachix-action-v15

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What's Changed

• Pass cachixArgs to the daemon by @​sandydoo in https://github.com/cachix/cachix-action/pull/177
• Support path filtering when using the daemon by @​sandydoo in https://github.com/cachix/cachix-action/pull/182
• Skip prep steps if using pathsToPush by @​sandydoo in https://github.com/cachix/cachix-action/pull/180
• store-scan: improve error handling when listing the store fails by @​sandydoo in https://github.com/cachix/cachix-action/pull/183

Full Changelog: cachix/cachix-action@v14...v15

v14: cachix-action-v14

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https://blog.cachix.org/posts/2024-01-12-cachix-v1-7/

v13: cachix-action-v13

Compare Source

• run on node20
• add skipAddingSubstituter to skip running cachix use

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