migrate `--experimental-txn-mode-write-with-shared-buffer` flag to feature gate. #5668

	---
	name: Coverage
	on: [push, pull_request]
	permissions: read-all
	jobs:
	coverage:
	# this is to prevent the job to run at forked projects
	if: github.repository == 'etcd-io/etcd'
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	target:
	- linux-amd64-coverage
	steps:
	- uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
	- id: goversion
	run: echo "goversion=$(cat .go-version)" >> "$GITHUB_OUTPUT"
	- uses: actions/setup-go@3041bf56c941b39c61721a86cd11f3bb1338122a # v5.2.0
	with:
	go-version: ${{ steps.goversion.outputs.goversion }}
	- env:
	TARGET: ${{ matrix.target }}
	run: \|
	mkdir "${TARGET}"
	case "${TARGET}" in
	linux-amd64-coverage)
	GOARCH=amd64 ./scripts/codecov_upload.sh
	;;
	*)
	echo "Failed to find target"
	exit 1
	;;
	esac

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