fix: support walking up parent directories to find Earthfile

[janishorsts]

Executing earth inside the internal directory, the targets are prefixed with a relative path to Earthfile.

✗ next +lint
 Init 🚀
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           buildkitd | Found buildkit daemon as podman container (earthly-buildkitd)
           buildkitd | Using a non-EarthBuild version of Buildkit is not supported.
           buildkitd |   Supported: github.com/EarthBuild/buildkit
           buildkitd |   Detected:  github.com/earthly/buildkit

 Build 🔧
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      registry-proxy | Registry proxy not supported on Podman. Falling back to tar-based outputs.
             ..+lint | --> FROM +base
             ..+lint | --> FROM +go
               ..+go | --> FROM +base
golang:1.26.4-alpine3.24 | --> Load metadata golang:1.26.4-alpine3.24 linux/arm64
             ..+code | --> FROM +base
             ..+code | --> FROM +deps
             ..+deps | --> FROM +base
             ..+deps | --> FROM +go
               ..+go | --> FROM golang:1.26.4-alpine3.24
               ..+go | [----------] 100% FROM golang:1.26.4-alpine3.24
               ..+go | *cached* --> RUN apk add --no-cache git
               ..+go | *cached* --> WORKDIR /earthly
             ..+deps | *cached* --> COPY go.mod go.sum ./
             ..+deps | *cached* --> RUN go mod download
             ..+code | *cached* --> mkdir /run
             ..+code | *cached* --> IF [ "$BUILDKIT_PROJECT" != "" ]
             ..+code | *cached* --> COPY --dir autocomplete buildcontext builder cleanup cmd config conslogging debugger docker2earth dockertar domain earthfile2llb features internal logbus logstream regproxy states slog util variables ./
             ..+code | *cached* --> COPY --dir buildkitd/buildkitd.go buildkitd/settings.go buildkitd/certificates.go buildkitd/
             ..+code | *cached* --> COPY --dir inputgraph/*.go inputgraph/testdata inputgraph/
             ..+lint | *cached* --> RUN apk add --no-cache curl
             ..+lint | *cached* --> RUN curl -sSfL --retry 7 --retry-all-errors -o /tmp/golangci-install.sh https://raw.githubusercontent.com/golangci/golangci-lint/main/install.sh && sh /tmp/golangci-install.sh -b $(go env GOPATH)/bin v$golangci_lint_version && rm /tmp/golangci-install.sh
             ..+lint | *cached* --> COPY ./.golangci.yaml .
             ..+lint | *cached* --> COPY --dir ..+code/earthly /
             ..+lint | *cached* --> mkdir /run/buildargs
             ..+lint | *cached* --> FOR $(find . -name go.mod -print0 | xargs -0 dirname)
             ..+lint | *cached* --> mkdir /run/buildargs
             ..+lint | *cached* --> expandargs cd $mod_path && go list -m -f '{{.Path}}'
             ..+lint | *cached* --> RUN echo "🧹 lint go module \"$mod_name\"" && cd $mod_path && golangci-lint run --config=/earthly/.golangci.yaml
              output | --> exporting outputs

 Push Summary ⏫ (disabled)
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To enable pushing use earthly --push

 Local Output Summary 🎁
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=========================== 🌍 Earth Build  ✅ SUCCESS ===========================

[github-actions]

➖ Are we earthbuild yet?

No change in "earthly" occurrences

📈 Overall Progress

Branch	Total Count
main	5342
This PR	5342
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]

Code Review

This pull request introduces a mechanism to automatically resolve and rewrite Earthfile references for the root of a project by walking up the directory tree to find the nearest ancestor containing an Earthfile. It also adds comprehensive unit tests for this new behavior. The review feedback highlights a potential test flakiness issue in environments where GOTMPDIR is located within a repository containing an Earthfile at its root, and suggests a robust way to verify the resolved path.

Important

The consumer version of Gemini Code Assist on GitHub is being sunset. Starting June 18, 2026, new organization installations will be blocked, and all code review activity will officially cease on July 17, 2026.
For more details on the timeline and next steps, please review the Help Documentation.