[k8s] Add elastic-agent helm-chart (#5331)

* feat: add elastic-agent helm-chart

* feat: update examples root README.md

* feat: add integration tests for the elastic-agent helm chart

* feat: remove redundant option agent.enabled from values.yaml

* feat: add mage target to render helm examples

* feat: add mage target to lint helm chart

* feat: add ECK example

* fix: replace empty with required in elasticagent.init.fleet named template

* fix: remove redundant isdir check from helm:renderexamples mage target

* fix: allow to render helm examples without an actual k8s cluster

* fix: add
app.kubernetes.io/version in common labels

* fix: change cluster role and cluster role binding naming pattern

* fix: revisit cluster role and cluster role binding naming pattern

* fix: change to elastic-agent image that doesn't contain synthetics

* fix: typo in eck example README.md

* fix: include helm release name in k8s objects

* feat: add helm:updateAgentVersion mage target

* fix: resolve merge conflicts

* fix: resolve merge conflicts

.gitignore

@@ -53,6 +53,7 @@ build/
 elastic-agent
 elastic-agent.dev.yml
 elastic-agent.yml.*
+!deploy/helm/*
 fleet.yml
 fleet.yml.lock
 fleet.yml.old

Makefile

@@ -37,6 +37,9 @@ check-ci:
 	@$(MAKE) notice
 	@GENERATEKUSTOMIZE=true $(MAKE) -C deploy/kubernetes generate-k8s
 	@$(MAKE) -C deploy/kubernetes generate-k8s
+	@mage -v helm:lint
+	@mage -v helm:updateAgentVersion
+	@mage -v helm:renderExamples
 	@$(MAKE) check-no-changes
 
 ## check: run all the checks including linting using golangci-lint.

deploy/helm/elastic-agent/.helmignore

@@ -0,0 +1,26 @@
+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*.orig
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/
+
+examples/*
+README.md.gotmpl

deploy/helm/elastic-agent/Chart.yaml

@@ -0,0 +1,6 @@
+apiVersion: v2
+name: elastic-agent
+description: Elastic-Agent Helm Chart
+kubeVersion: ">= 1.27.0-0"
+type: application
+version: 0.0.1

deploy/helm/elastic-agent/LICENSE

@@ -0,0 +1,93 @@
+Elastic License 2.0
+
+URL: https://www.elastic.co/licensing/elastic-license
+
+## Acceptance
+
+By using the software, you agree to all of the terms and conditions below.
+
+## Copyright License
+
+The licensor grants you a non-exclusive, royalty-free, worldwide,
+non-sublicensable, non-transferable license to use, copy, distribute, make
+available, and prepare derivative works of the software, in each case subject to
+the limitations and conditions below.
+
+## Limitations
+
+You may not provide the software to third parties as a hosted or managed
+service, where the service provides users with access to any substantial set of
+the features or functionality of the software.
+
+You may not move, change, disable, or circumvent the license key functionality
+in the software, and you may not remove or obscure any functionality in the
+software that is protected by the license key.
+
+You may not alter, remove, or obscure any licensing, copyright, or other notices
+of the licensor in the software. Any use of the licensor’s trademarks is subject
+to applicable law.
+
+## Patents
+
+The licensor grants you a license, under any patent claims the licensor can
+license, or becomes able to license, to make, have made, use, sell, offer for
+sale, import and have imported the software, in each case subject to the
+limitations and conditions in this license. This license does not cover any
+patent claims that you cause to be infringed by modifications or additions to
+the software. If you or your company make any written claim that the software
+infringes or contributes to infringement of any patent, your patent license for
+the software granted under these terms ends immediately. If your company makes
+such a claim, your patent license ends immediately for work on behalf of your
+company.
+
+## Notices
+
+You must ensure that anyone who gets a copy of any part of the software from you
+also gets a copy of these terms.
+
+If you modify the software, you must include in any modified copies of the
+software prominent notices stating that you have modified the software.
+
+## No Other Rights
+
+These terms do not imply any licenses other than those expressly granted in
+these terms.
+
+## Termination
+
+If you use the software in violation of these terms, such use is not licensed,
+and your licenses will automatically terminate. If the licensor provides you
+with a notice of your violation, and you cease all violation of this license no
+later than 30 days after you receive that notice, your licenses will be
+reinstated retroactively. However, if you violate these terms after such
+reinstatement, any additional violation of these terms will cause your licenses
+to terminate automatically and permanently.
+
+## No Liability
+
+*As far as the law allows, the software comes as is, without any warranty or
+condition, and the licensor will not be liable to you for any damages arising
+out of these terms or the use or nature of the software, under any kind of
+legal claim.*
+
+## Definitions
+
+The **licensor** is the entity offering these terms, and the **software** is the
+software the licensor makes available under these terms, including any portion
+of it.
+
+**you** refers to the individual or entity agreeing to these terms.
+
+**your company** is any legal entity, sole proprietorship, or other kind of
+organization that you work for, plus all organizations that have control over,
+are under the control of, or are under common control with that
+organization. **control** means ownership of substantially all the assets of an
+entity, or the power to direct its management and policies by vote, contract, or
+otherwise. Control can be direct or indirect.
+
+**your licenses** are all the licenses granted to you for the software under
+these terms.
+
+**use** means anything you do with the software requiring one of your licenses.
+
+**trademark** means trademarks, service marks, and similar rights.