Add support to run on Kubernetes, add Helm chart

See relevant README.md for more details.

kubernetes/templates/_helpers.tpl

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+{{/* vim: set filetype=mustache: */}}
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "invidious.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).
+*/}}
+{{- define "invidious.fullname" -}}
+{{- $name := default .Chart.Name .Values.nameOverride -}}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}}
+{{- end -}}

kubernetes/templates/configmap.yaml

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+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: {{ template "invidious.fullname" . }}
+  labels:
+    app: {{ template "invidious.name" . }}
+    chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
+    release: {{ .Release.Name }}
+data:
+  INVIDIOUS_CONFIG: |
+{{ toYaml .Values.config | indent 4 }}

kubernetes/templates/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: {{ template "invidious.fullname" . }}
+  labels:
+    app: {{ template "invidious.name" . }}
+    chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
+    release: {{ .Release.Name }}
+spec:
+  replicas: {{ .Values.replicaCount }}
+  selector:
+    matchLabels:
+      app: {{ template "invidious.name" . }}
+      release: {{ .Release.Name }}
+  template:
+    metadata:
+      labels:
+        app: {{ template "invidious.name" . }}
+        chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
+        release: {{ .Release.Name }}
+    spec:
+      securityContext:
+        runAsUser: {{ .Values.securityContext.runAsUser }}
+        runAsGroup: {{ .Values.securityContext.runAsGroup }}
+        fsGroup: {{ .Values.securityContext.fsGroup }}
+      containers:
+      - name: {{ .Chart.Name }}
+        image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+        imagePullPolicy: {{ .Values.image.pullPolicy }}
+        ports:
+        - containerPort: 3000
+        env:
+        - name: INVIDIOUS_CONFIG
+          valueFrom:
+            configMapKeyRef:
+              key: INVIDIOUS_CONFIG
+              name: {{ template "invidious.fullname" . }}
+        securityContext:
+          allowPrivilegeEscalation: {{ .Values.securityContext.allowPrivilegeEscalation }}
+          capabilities:
+            drop:
+            - ALL
+        resources:
+{{ toYaml .Values.resources | indent 10 }}
+        readinessProbe:
+          httpGet:
+            port: 3000
+            path: /
+        livenessProbe:
+          httpGet:
+            port: 3000
+            path: /
+      restartPolicy: Always

kubernetes/templates/hpa.yaml

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+{{- if .Values.autoscaling.enabled }}
+apiVersion: autoscaling/v1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ template "invidious.fullname" . }}
+  labels:
+    app: {{ template "invidious.name" . }}
+    chart: "{{ .Chart.Name }}-{{ .Chart.Version }}"
+    release: {{ .Release.Name }}
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ template "invidious.fullname" . }}
+  minReplicas: {{ .Values.autoscaling.minReplicas }}
+  maxReplicas: {{ .Values.autoscaling.maxReplicas }}
+  targetCPUUtilizationPercentage: {{ .Values.autoscaling.targetCPUUtilizationPercentage }}
+{{- end }}

kubernetes/templates/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ template "invidious.fullname" . }}
+  labels:
+    app: {{ template "invidious.name" . }}
+    chart: {{ .Chart.Name }}
+    release: {{ .Release.Name }}
+spec:
+  ports:
+  - name: http
+    port: 3000
+    targetPort: 3000
+  selector:
+    app: {{ template "invidious.name" . }}
+    release: {{ .Release.Name }}