[Internal] Use error names instead of codes in `errors.go` #2860

	name: build

	on:
	pull_request:
	types: [opened, synchronize]
	merge_group:
	types: [checks_requested]
	push:
	# Always run on push to main. The build cache can only be reused
	# if it was saved by a run from the repository's default branch.
	# The run result will be identical to that from the merge queue
	# because the commit is identical, yet we need to perform it to
	# seed the build cache.
	branches:
	- main

	jobs:
	tests:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	goVersion:
	- "1.19"
	- "1.20"
	- "1.21"
	- "1.22"
	steps:
	- name: Checkout
	uses: actions/checkout@v4

	- name: Setup Go
	uses: actions/setup-go@v5
	with:
	go-version: ${{ matrix.goVersion }}

	- name: Set go env
	run: \|
	echo "GOPATH=$(go env GOPATH)" >> $GITHUB_ENV
	echo "$(go env GOPATH)/bin" >> $GITHUB_PATH

	- name: Pull external libraries
	run: make vendor

	- name: Run tests
	run: make test

	- name: Publish test coverage
	uses: codecov/codecov-action@v4
	env:
	CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

	fmt:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout
	uses: actions/checkout@v4

	- name: Setup Go
	uses: actions/setup-go@v5
	with:
	go-version: "1.22"

	# No need to download cached dependencies when running gofmt.
	cache: false

	- name: Run gofmt
	run: \|
	# -l: list files that were reformatted
	# -w: write back formatted files to disk
	gofmt -l -w ./

	- name: Fail on differences
	run: \|
	# Exit with status code 1 if there are differences (i.e. unformatted files)
	git diff --exit-code

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