[gatus] Add gatus chart (#1569)

* Add gatus chart

Signed-off-by: David Young <davidy@funkypenguin.co.nz>

* Correct sloppy PR

Signed-off-by: David Young <davidy@funkypenguin.co.nz>

* Trim trailing whitespace

Signed-off-by: David Young <davidy@funkypenguin.co.nz>

* Fix port

Signed-off-by: David Young <davidy@funkypenguin.co.nz>

charts/stable/gatus/.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
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj
+.vscode/
+# OWNERS file for Kubernetes
+OWNERS
+# helm-docs templates
+*.gotmpl

charts/stable/gatus/Chart.yaml

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+---
+apiVersion: v2
+appVersion: v3.8.0
+description: A developer-oriented health dashboard that gives you the ability to monitor your services using HTTP, ICMP, TCP, and even DNS queries.
+icon: https://github.com/TwiN/gatus/raw/master/.github/assets/logo-with-dark-text.png
+home: https://github.com/k8s-at-home/charts/tree/master/charts/stable/gatus
+name: gatus
+version: 1.0.0
+kubeVersion: ">=1.16.0-0"
+sources:
+  - https://github.com/TwiN/gatus
+maintainers:
+  - name: funkypenguin
+    email: davidy@funkypenguin.co.nz
+dependencies:
+  - name: common
+    repository: https://library-charts.k8s-at-home.com
+    version: 4.4.2
+annotations:
+  artifacthub.io/changes: |-
+    - kind: added
+      description: Initial version

charts/stable/gatus/README_CONFIG.md.gotmpl

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+{{- define "custom.custom.configuration.header" -}}
+## Custom configuration
+{{- end -}}
+
+{{- define "custom.custom.configuration" -}}
+{{ template "custom.custom.configuration.header" . }}
+
+N/A
+{{- end -}}

charts/stable/gatus/templates/common.yaml

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+{{/* Make sure all variables are set properly */}}
+{{- include "common.values.setup" . }}
+
+{{/* Append the hardcoded settings */}}
+{{- define "gatus.harcodedValues" -}}
+  {{- if .Values.configmap.config.enabled }}
+  {{/* merge gatus specific annotations with podAnnotations*/}}
+  podAnnotations:
+    configmap/checksum: "{{ .Values.configmap.config.data | toYaml | sha256sum }}"
+  {{- end }}
+
+  {{- if .Values.configmap.config.enabled }}
+  {{/* Append the configMap volume to the volumes */}}
+  persistence:
+    config:
+      enabled: true
+      type: "configMap"
+      name: "{{ include "common.names.fullname" . }}-config"
+      mountPath: "/www/assets/config.yml"
+      subPath: "config.yml"
+  {{- end }}
+{{- end -}}
+{{- $_ := mergeOverwrite .Values (include "gatus.harcodedValues" . | fromYaml) -}}
+
+{{/* Render the templates */}}
+{{ include "common.all" . }}

charts/stable/gatus/values.yaml

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+#
+# IMPORTANT NOTE
+#
+# This chart inherits from our common library chart. You can check the default values/options here:
+# https://github.com/k8s-at-home/library-charts/tree/main/charts/stable/common/values.yaml
+#
+
+image:
+  # -- image repository
+  repository: twinproduction/gatus
+  # -- image tag
+  # @default -- chart.appVersion
+  tag:
+  # -- image pull policy
+  pullPolicy: IfNotPresent
+
+# -- environment variables.
+# @default -- See below
+env:
+  # -- Set the container timezone
+  TZ: UTC
+
+# -- Configures service settings for the chart.
+# @default -- See values.yaml
+service:
+  main:
+    ports:
+      http:
+        port: 8080
+
+ingress:
+  # -- Enable and configure ingress settings for the chart under this key.
+  # @default -- See values.yaml
+  main:
+    enabled: false
+
+# -- Configure persistence settings for the chart under this key.
+# @default -- See values.yaml
+persistence:
+  config:
+    enabled: "true"
+    mountPath: "/config/config.yaml"
+    subPath: "config.yaml"
+    type: "custom"
+    volumeSpec:
+      configMap:
+        name: gatus-config
+
+configmap:
+  config:
+    # -- Store gatus configuration as a ConfigMap
+    enabled: true
+    # -- Gatus configuration. See [image documentation](https://github.com/TwiN/gatus/blob/master/config.yaml) for more information.
+    # @default -- See values.yaml
+    data:
+      config.yaml: |
+        storage:
+          type: sqlite
+          path: /data/data.db
+
+        endpoints:
+          - name: Google
+            url: "https://www.google.com"
+            interval: 5m
+            conditions:
+              - "[STATUS] == 200"