chore(lint): enable errname

[janishorsts]

No description provided.

[github-actions]

➖ Are we earthbuild yet?

No change in "earthly" occurrences

📈 Overall Progress

Branch	Total Count
main	5704
This PR	5704
Difference	+0

---

Keep up the great work migrating from Earthly to Earthbuild! 🚀

💡 Tips for finding more occurrences

Run locally to see detailed breakdown:

./.github/scripts/count-earthly.sh

Note that the goal is not to reach 0.
There is anticipated to be at least some occurences of earthly in the source code due to backwards compatibility with config files and language constructs.

[gemini-code-assist]

Summary of Changes

Hello @janishorsts, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on refactoring error naming conventions across the codebase to comply with the errname linter's guidelines. It involves renaming specific error types and variables to follow the Error suffix for types and err prefix for variables. Additionally, documentation comments have been added to Error() methods for better clarity. While the pull request title indicates an intent to "enable errname", the linter's configuration in .golangci.yaml shows it being removed, suggesting either a temporary disablement during the fix process or a discrepancy between the title's intent and the configuration change.

Highlights

• Error Naming Convention Refactoring: Renamed error types (e.g., "ErrEarthfileNotExist" to "EarthfileNotExistError") and error variables (e.g., "earthlyDirCreateErr" to "errEarthlyDirCreate") to align with Go's errname linter rules.
• Error Interface Documentation: Added // Error implements [error] interface. comments to Error() methods in several custom error types for improved clarity and documentation.
• Linter Configuration Adjustment: The errname linter has been removed from the .golangci.yaml configuration. This action contradicts the pull request title "enable errname", but the code changes themselves address violations that the errname linter would identify, suggesting a preparation phase for its eventual re-enablement.

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[gemini-code-assist]

Code Review

This pull request enables the errname linter and applies the necessary fixes across the codebase. The changes correctly rename error types to end with Error and error variables to start with err. The updated comments on Error() methods are also a good improvement for code clarity. I've found one minor issue related to an error type check that I've commented on. Overall, this is a good cleanup PR.

[gemini-code-assist]

The EarthfileNotExistError is returned as a value, not a pointer, in buildcontext/detectbuildfile.go. This type switch should therefore check for the value type buildcontext.EarthfileNotExistError instead of the pointer type *buildcontext.EarthfileNotExistError to correctly handle the error.

Suggested change

	case *buildcontext.EarthfileNotExistError:
	case buildcontext.EarthfileNotExistError: