fix: out of disk by sharing the temp directory across packages

[not-matthias]

Fixes #37

Changes in this PR:

• Delete raw_results after we parse it to avoid out of disk errors
• The templater now returns a CodspeedContext struct which stores all the temporary modifications that should be reverted afterwards.
  • This required a refactor of the patcher to save the previous file paths and package names. This was needed because you could define a global flag in another package that would result in a build error (happened in the hugo project).
• Switched to mialloc because we're spending a lot of time allocating memory

[codspeed-hq]

CodSpeed Performance Report

Merging #38 will degrade performances by 15.35%

_{Comparing cod-1694-allow-configuring-cleanup-of-temporary-files (c5f02fb) with main (0b914bf)}

Summary

⚡ 1 improvement
❌ 5 regressions
✅ 34 untouched

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	bench_collect_results[1000000, 10]	211.8 ms	247.7 ms	-14.46%
❌	bench_collect_results[1000000, 25]	447.2 ms	523.3 ms	-14.55%
❌	bench_collect_results[1000000, 5]	181.4 ms	213.2 ms	-14.9%
❌	bench_collect_results[500000, 10]	104.3 ms	123.2 ms	-15.35%
❌	bench_collect_results[500000, 25]	225.4 ms	256.1 ms	-12%
⚡	bench_go_runner	59.7 s	22.4 s	×2.7

[Copilot]

Pull Request Overview

This PR addresses out-of-disk-space issues by optimizing temporary directory usage and implementing proper cleanup mechanisms. The changes introduce a shared temporary directory across packages and automatic reversion of file modifications.

• Refactored Templater to use a single shared temporary directory via OnceCell instead of creating one per package
• Introduced CodspeedContext struct to encapsulate package-specific setup with cleanup tracking via a Patcher that reverts changes on drop
• Added cleanup of raw results directory after parsing to save disk space

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
go-runner/tests/utils.rs	Updated test utilities to use new Templater API with CodspeedContext
go-runner/src/results/raw_result.rs	Changed glob pattern to expect raw results directly in provided folder path
go-runner/src/lib.rs	Added raw_results subdirectory handling, cleanup logic, and empty results validation
go-runner/src/builder/templater.rs	Major refactor introducing CodspeedContext and shared temp directory via OnceCell
go-runner/src/builder/patcher.rs	Extracted Patcher struct with state tracking and automatic reversion via Drop trait
go-runner/Cargo.toml	Added once_cell dependency for lazy initialization
Cargo.lock	Updated lockfile with once_cell dependency

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[GuillaumeLagrange]

small comments + the changes we discussed to make use of git to revert rather than manually undoing the patches

[GuillaumeLagrange]

olgtm, almost there!