feat: Elastic Agent Standalone Helm Chart

[kuisathaverat]

What does this PR do?

It adds a Helm chart deployment for the Elastic Agent in the deployments folder.

Why is it important?

Helm charts are a common way to make deployments in Kubernetes.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

How to test this PR locally

Tested with kind

git clone git@github.com:kuisathaverat/beats.git
cd beats/deploy/kubernetes/helm-charts/elastic_agent
kind create cluster
kubectl apply -f https://raw.githubusercontent.com/rancher/local-path-provisioner/master/deploy/local-path-storage.yaml
helm repo add elastic https://helm.elastic.co
helm install elasticsearch elastic/elasticsearch --set "imageTag=7.15.0,esJavaOpts='-Xmx1g -Xms1g',antiAffinity=soft,replicas=1,minimumMasterNodes=1" 
helm install kibana  elastic/kibana --set "imageTag=7.15.0"

After Elasticsearch and Kibana are up and running, you will install the Fleet Server.
To configure the Fleet Server you need to get the FLEET_SERVER_SERVICE_TOKEN from kibana fleet section,
then update the helm-values-fleet-server.yml file,
finally run the following command.

helm install fleet-server ./ --values helm-values-fleet-server.yml

helm install elastic-agent ./  --values helm-values.yml

helm-values.yml

helm-values-fleet-server.yml

Related issues

• Relates [Elastic Agent] Helm Charts #22572

Use cases

[elasticmachine]

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Build stats

• Start Time: 2021-09-23T17:26:57.098+0000

• Duration: 11 min 25 sec

• Commit: c4d5e4d

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make check-default

• Took 1 min 10 sec . View more details here
• Description: make check-default

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• Description: Error 'hudson.AbortException: script returned exit code 2'

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[kuisathaverat]

I will make a new PR