Bump golang from 1.19 to 1.21 in /images/operator-sdk #4834

	name: go
	on:
	pull_request: {}

	env:
	MEMCACHED_IMAGE: "memcached:1.4.36-alpine"

	jobs:
	check_docs_only:
	name: check_docs_only
	runs-on: ubuntu-22.04
	outputs:
	skip: ${{ steps.check_docs_only.outputs.skip }}
	steps:
	- uses: actions/checkout@v3
	with:
	fetch-depth: 0
	- id: check_docs_only
	# Since PR's are squashed prior to merging to the branch checked out (default branch),
	# HEAD^ will resolve to the previous point in history.
	run: \|
	REF="HEAD^"
	[[ -z "${{ github.base_ref }}" ]] \|\| REF=$(git show-ref ${{ github.base_ref }} \| head -1 \| cut -d' ' -f2)
	echo "::set-output name=skip::$(.github/workflows/check-docs-only.sh $REF)"

	e2e:
	name: e2e
	runs-on: ubuntu-22.04
	needs: check_docs_only
	if: needs.check_docs_only.outputs.skip != 'true'
	steps:
	- uses: actions/setup-go@v3
	with:
	go-version: 1.19
	- uses: actions/checkout@v3
	with:
	fetch-depth: 0
	- run: sudo rm -rf /usr/local/bin/kustomize
	- run: make test-e2e-go

	unit:
	name: unit
	runs-on: ubuntu-22.04
	needs: check_docs_only
	if: needs.check_docs_only.outputs.skip != 'true'
	steps:
	- uses: actions/setup-go@v3
	with:
	go-version: 1.19
	- uses: actions/checkout@v3
	with:
	fetch-depth: 0
	- run: make test-unit
	- uses: shogo82148/actions-goveralls@v1
	with:
	path-to-profile: coverage.out

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