feat: Add helm chart for the app (#65)

deployments/helm/templates/_helpers.tpl

@@ -0,0 +1,52 @@
+{{/* Define namespace of chart, useful for multi-namespace deployments */}}
+{{- define "proxy-3proxy.namespace" -}}
+  {{- if .Values.namespaceOverride }}
+    {{- .Values.namespaceOverride }}
+  {{- else }}
+    {{- .Release.Namespace }}
+  {{- end }}
+{{- end }}
+
+{{/* Expand the name of the chart */}}
+{{- define "proxy-3proxy.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 "proxy-3proxy.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 "proxy-3proxy.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
+{{- end }}
+
+{{/* Common labels */}}
+{{- define "proxy-3proxy.commonLabels" -}}
+helm.sh/chart: {{ include "proxy-3proxy.chart" . }}
+{{ include "proxy-3proxy.selectorLabels" . }}
+{{- if .Chart.AppVersion }}
+app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+{{- end }}
+app.kubernetes.io/managed-by: {{ .Release.Service }}
+{{- end }}
+
+{{/* Selector labels */}}
+{{- define "proxy-3proxy.selectorLabels" -}}
+app.kubernetes.io/name: {{ include "proxy-3proxy.name" . }}
+app.kubernetes.io/instance: {{ .Release.Name }}
+{{- end }}