ci: run benchmarks using Codspeed

[marten-seemann]

Add CodSpeed benchmark job to CI to run Go benchmarks on push to master, pull requests, and manual dispatch using walltime mode on the codspeed-macro runner

Add a 'Benchmarks' GitHub Actions workflow that checks out code, sets up Go 1.25.x, and runs CodSpeedHQ/action@v4 with mode=walltime executing go test -run=^$ -bench=. ./... on the codspeed-macro runner.

📍Where to Start

Start with the workflow definition in benchmark.yml.

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Macroscope summarized 9f4564c.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.62%. Comparing base (1661efa) to head (9f4564c).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #80   +/-   ##
=======================================
  Coverage   93.62%   93.62%           
=======================================
  Files           5        5           
  Lines         188      188           
=======================================
  Hits          176      176           
  Misses          6        6           
  Partials        6        6           

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[Copilot]

Pull request overview

This pull request adds a new GitHub Actions workflow to run Go benchmarks using CodSpeed, a continuous benchmarking platform. The workflow is triggered on pushes to the master branch, pull requests, and manual workflow dispatches.

Key Changes:

• Adds a new benchmark workflow file that integrates with CodSpeed for performance tracking
• Configures the workflow to run all Go benchmarks in the repository using go test -bench=.
• Uses CodSpeed's specialized runner (codspeed-macro) for consistent benchmark measurements

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[macroscopeapp]

go-version is set to 1.25.x, which doesn’t exist. Consider using a valid release (e.g., 1.22.x) so actions/setup-go can install it.

Suggested change

	go-version: "1.25.x"
	go-version: "1.22.x"

🚀 Want me to fix this? Reply ex: "fix it for me".

[marten-seemann]

What an utter nonsense.

[codspeed-hq]

CodSpeed Performance Report

Congrats! CodSpeed is installed 🎉

🆕 4 new benchmarks were detected.

You will start to see performance impacts in the reports once the benchmarks are run from your default branch.

Detected benchmarks

• indexed_field: 324 ns
• literal_field_with_Huffman_encoding: 1.5 µs
• literal_field_without_name_reference: 576 ns
• literal_field_with_name_reference: 492 ns