Add Krew installation instructions to README #8

	# CI: test and lint on push/PR. No release.
	name: ci
	on:
	push:
	branches: [main, master]
	pull_request:
	branches: [main, master]
	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Set up Go
	uses: actions/setup-go@v5
	with:
	go-version: '1.21'

	- name: Cache go modules
	uses: actions/cache@v4
	with:
	path: ~/go/pkg/mod
	key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
	restore-keys: \|
	${{ runner.os }}-go-

	- name: Tidy
	run: go mod tidy

	- name: Vet
	run: go vet ./pkg/... ./cmd/...

	- name: Test
	run: go test ./pkg/... ./cmd/... -v -count=1 -coverprofile=cover.out -covermode=atomic

	- name: Upload coverage
	uses: actions/upload-artifact@v4
	if: always()
	with:
	name: coverage
	path: cover.out

	lint:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Set up Go
	uses: actions/setup-go@v5
	with:
	go-version: '1.21'

	- name: golangci-lint
	uses: golangci/golangci-lint-action@v4
	with:
	version: latest
	args: --timeout=5m

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