Add helm chart for NGTS-capable agent

deploy/charts/discovery-agent/.helmignore

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+# 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/

deploy/charts/discovery-agent/Chart.yaml

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+apiVersion: v2
+name: discovery-agent
+description: |-
+  The discovery-agent connects your Kubernetes or Openshift cluster to NGTS for discovery and monitoring.
+
+maintainers:
+  - name: Palo Alto Networks
+    url: https://www.paloaltonetworks.com
+
+sources:
+  - https://github.com/jetstack/jetstack-secure
+
+# These versions are meant to be overridden by `make helm-chart`. No `v` prefix
+# for the `version` because Helm doesn't support auto-determining the latest
+# version for OCI Helm charts that use a `v` prefix.
+version: 0.0.0
+appVersion: "v0.0.0"