feat(argocd): Helm chart for Argo CD applications (#10)

This PR is for creating a Helm chart for gateway argo CD applications
which will be synced with Helm repository.

[TD-912](https://glassdomeinc.atlassian.net/browse/TD-912)

[TD-912]:
https://glassdomeinc.atlassian.net/browse/TD-912?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

charts/gateway-argocd/.helmignore

@@ -0,0 +1,23 @@
+# 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/

charts/gateway-argocd/Chart.yaml

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+apiVersion: v2
+name: gateway-argocd
+description: Gateway Argo CD
+
+# A chart can be either an 'application' or a 'library' chart.
+#
+# Application charts are a collection of templates that can be packaged into versioned archives
+# to be deployed.
+#
+# Library charts provide useful utilities or functions for the chart developer. They're included as
+# a dependency of application charts to inject those utilities and functions into the rendering
+# pipeline. Library charts do not define any templates and therefore cannot be deployed.
+type: application
+
+# This is the chart version. This version number should be incremented each time you make changes
+# to the chart and its templates, including the app version.
+# Versions are expected to follow Semantic Versioning (https://semver.org/)
+version: 0.1.0
+
+# This is the version number of the application being deployed. This version number should be
+# incremented each time you make changes to the application. Versions are not expected to
+# follow Semantic Versioning. They should reflect the version the application is using.
+# It is recommended to use it with quotes.
+appVersion: "0.1.0"

charts/gateway-argocd/templates/_helpers.tpl

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+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "gateway-argocd.name" -}}
+{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Create a default fully qualified app name.
+We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
+If release name contains chart name it will be used as a full name.
+*/}}
+{{- define "gateway-argocd.fullname" -}}
+{{- if .Values.fullnameOverride }}
+{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- $name := default .Chart.Name .Values.nameOverride }}
+{{- if contains $name .Release.Name }}
+{{- .Release.Name | trunc 63 | trimSuffix "-" }}
+{{- else }}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" }}
+{{- end }}
+{{- end }}
+{{- end }}
+
+{{/*
+Create chart name and version as used by the chart label.
+*/}}
+{{- define "gateway-argocd.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/*
+Common labels
+*/}}
+{{- define "gateway-argocd.labels" -}}
+helm.sh/chart: {{ include "gateway-argocd.chart" . }}
+{{ include "gateway-argocd.selectorLabels" . }}
+{{- if .Chart.AppVersion }}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+{{/*
+Selector labels
+*/}}
+{{- define "gateway-argocd.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "gateway-argocd.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "gateway-argocd.serviceAccountName" -}}
+{{- if .Values.serviceAccount.create }}
+{{- default (include "gateway-argocd.fullname" .) .Values.serviceAccount.name }}
+{{- else }}
+{{- default "default" .Values.serviceAccount.name }}
+{{- end }}
+{{- end }}

charts/gateway-argocd/templates/gateway-argocd.yaml

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+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: gateway-argocd
+  namespace: argocd
+  labels:
+    name: gateway-argocd
+spec:
+  project: gateway
+
+  source:
+    repoURL: https://charts.glassdome.com/
+    targetRevision: "*"
+    chart: gateway-argocd
+
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: argocd
+
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - PrunePropagationPolicy=foreground
+      - PruneLast=true

charts/gateway-argocd/templates/gateway-console.yaml

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+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: gateway-console
+  namespace: argocd
+  labels:
+    name: gateway-console
+spec:
+  project: gateway
+
+  source:
+    repoURL: https://charts.glassdome.com/
+    targetRevision: "*"
+    chart: glassdome-gateway-console
+
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: glassdome-gateway-console
+
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true
+      - PrunePropagationPolicy=foreground
+      - PruneLast=true

charts/gateway-argocd/templates/gateway-project.yaml

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+apiVersion: argoproj.io/v1alpha1
+kind: AppProject
+metadata:
+  name: gateway
+  namespace: argocd
+  # Finalizer that ensures that project is not deleted until it is not referenced by any application
+  finalizers:
+    - resources-finalizer.argocd.argoproj.io
+spec:
+  description: gateway
+
+  sourceRepos:
+    - "*"
+
+  destinations:
+    - namespace: glassdome-gateway-console
+      server: https://kubernetes.default.svc
+      name: in-cluster
+    - namespace: argocd
+      server: https://kubernetes.default.svc
+      name: in-cluster
+
+  clusterResourceWhitelist:
+    - group: ""
+      kind: Namespace