Pin mainframe to `ec9fce9b` #109

	---
	name: CI - Kubernetes

	on:
	pull_request:
	push:
	branches:
	- main

	concurrency:
	group: ${{ github.workflow }}-${{ github.event.pull_request.number \|\| github.ref }}
	cancel-in-progress: true

	defaults:
	run:
	shell: bash

	jobs:
	lint:
	name: Lint manifests

	strategy:
	fail-fast: false
	matrix:
	kubernetes-version:
	- '1.27'

	runs-on: ubuntu-22.04
	steps:
	- name: Checkout code
	uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1

	- name: Set up Go
	uses: actions/setup-go@cdcb36043654635271a94b9a6d1392de5bb323a7 # v5.0.1
	with:
	go-version: '1.21'

	- name: Install `kubectl-validate`
	run: go install -ldflags='-s -w' -race -trimpath sigs.k8s.io/kubectl-validate@latest

	- name: Lint manifests
	run: \|-
	kubectl-validate kubernetes/manifests/ \
	--local-crds kubernetes/crds/ \
	--version '${{ matrix.kubernetes-version }}'

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