Use always absolute output path

[ferranbt]

Fixes #343

[claude]

Claude finished @ferranbt's task in 1m 16s —— View job

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Review Complete

• Understand the issue being fixed (Playground fails to run host component with a custom output folder #343)
• Review the code changes
• Check for edge cases and potential issues
• Provide review feedback

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Summary: This PR fixes the output path handling to always use absolute paths when a custom output directory is specified. The changes look correct.

Changes reviewed:

1. playground/artifacts.go:525-532 - Adds conversion of relative paths to absolute paths in NewOutput(). This ensures that when a relative path like ./output is passed, it gets converted to an absolute path before being stored.

2. playground/components_test.go:203-204 - Updates tests to use NewOutput() instead of directly constructing the output struct. This is the correct approach since it ensures tests exercise the same code path as production.

Observations:

• The AbsoluteDstPath() method at line 559 now becomes somewhat redundant since dst is already guaranteed to be absolute after NewOutput(). It will effectively just return o.dst. However, keeping it provides backward compatibility if there are any code paths that construct output directly without going through NewOutput().

• The test change removes the custom homeDir assignment. Previously the test set homeDir: filepath.Join(e2eTestDir, "artifacts"), but now it uses the global home directory from GetHomeDir(). This should be fine for test purposes but is a subtle behavioral change.

No blocking issues found. LGTM.

[claude]

Claude finished @ferranbt's task in 59s —— View job

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PR Review Complete

• Understand the issue being fixed (Playground fails to run host component with a custom output folder #343)
• Review the code changes in detail
• Check for edge cases and potential issues
• Provide review feedback

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Summary: This PR ensures that when a custom output directory is specified (e.g., ./output), it gets converted to an absolute path early in NewOutput(), rather than at usage time in toDockerComposeService().

Changes:

1. playground/artifacts.go:525-532 - Adds conversion of relative paths to absolute paths in NewOutput() when a non-empty dst is provided.

2. playground/artifacts.go - Removes the AbsoluteDstPath() method since dst is now guaranteed to be absolute after NewOutput().

3. playground/local_runner.go:500 - Simplifies toDockerComposeService() to use d.out.Dst() directly instead of the now-removed AbsoluteDstPath().

4. playground/components_test.go:203-204 - Updates tests to use NewOutput() instead of directly constructing the output struct. This ensures tests exercise the same code path as production.

No issues found. The changes are clean and the approach is sound - converting to absolute paths at construction time is better than doing it at each usage site.