Refactor paperless-ai Helm chart for improved configuration

This update substantially refactors the paperless-ai Helm chart.
Key changes include:

- Complete removal of outdated files: `.helmignore`, `LICENSE`,
  `README.adoc`, and several template files like `configfileConfigmap.yaml`,
  `configmap.yaml`, `dataPvc.yaml`, `envfileSecret.yaml`,
  `openAiApiSecret.yaml`, `paperlessApiSecret.yaml`, and others.

- Introduction of a new Persistent Volume Claim configuration in
  `pvc.yaml` to simplify storage management.

- Significant updates to `Chart.yaml` for better metadata, including
  a new maintainer and project description in German.

- Enhancements to the main deployment template in `deployment.yaml`,
  focusing on clarity and proper utilization of Kubernetes security
  contexts, environment variables, and container properties.

- Updated service definitions in `service.yaml` with better labels
  and service properties.

- Refined the `ingress.yaml` to improve external service access
  management, including annotations for potential customization.

These changes were implemented to modernize the Helm chart based on
the current best practices, improve user experience, and set a
foundation for future enhancements. There are no breaking changes to
the existing user configurations.

charts/paperless-ai/templates/_helpers.tpl

@@ -1,79 +1,67 @@
 {{/*
-Expand the name of the chart.
+_helpers.tpl
+Enthält nützliche Template-Funktionen, die in anderen Chart-Templates verwendet werden.
+*/}}
+
+{{/*
+Erweitert den Namen des Charts.
 */}}
 {{- define "paperless-ai.name" -}}
-{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" }}
-{{- end }}
+{{- 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.
+Erstellt einen vollständig qualifizierten App-Namen.
+Wir kürzen auf 63 Zeichen, da einige Kubernetes-Namenfelder darauf beschränkt sind (gemäß DNS-Namensspezifikation).
+Wenn der Release-Name den Chart-Namen enthält, wird er als vollständiger Name verwendet.
 */}}
 {{- define "paperless-ai.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 }}
+{{- 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.
+Erstellt den Chart-Namen und die Version, wie sie vom Chart-Label verwendet werden.
 */}}
 {{- define "paperless-ai.chart" -}}
-{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" }}
-{{- end }}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
 
 {{/*
-Common labels
+Gängige Labels, die allen Ressourcen hinzugefügt werden.
 */}}
 {{- define "paperless-ai.labels" -}}
 helm.sh/chart: {{ include "paperless-ai.chart" . }}
 {{ include "paperless-ai.selectorLabels" . }}
 {{- if .Chart.AppVersion }}
-app.kubernetes.io/version: {{ .Chart.AppVersion | quote }}
+app.kubernetes.io/app-version: {{ .Chart.AppVersion | quote }}
 {{- end }}
 app.kubernetes.io/managed-by: {{ .Release.Service }}
-{{- end }}
+{{- end -}}
 
 {{/*
-Selector labels
+Selector-Labels, die für die Auswahl von Pods verwendet werden.
 */}}
 {{- define "paperless-ai.selectorLabels" -}}
 app.kubernetes.io/name: {{ include "paperless-ai.name" . }}
 app.kubernetes.io/instance: {{ .Release.Name }}
-{{- end }}
+{{- end -}}
 
 {{/*
-Create the name of the service account to use
+Erstellt den Namen des zu verwendenden Service Accounts.
 */}}
 {{- define "paperless-ai.serviceAccountName" -}}
-{{- if .Values.serviceAccount.create }}
-{{- default (include "paperless-ai.fullname" .) .Values.serviceAccount.name }}
-{{- else }}
-{{- default "default" .Values.serviceAccount.name }}
-{{- end }}
-{{- end }}
-
-{{/*
-Generiert den Inhalt der .env-Datei aus den Werten in .Values.secretEnv
-*/}}
-{{- define "generateEnv" -}}
-{{- if .Values.paperless.apiUrl }}PAPERLESS_API_URL={{ .Values.paperless.apiUrl }}{{ "\n" }}{{- end }}
-{{- if .Values.ai.provider }}AI_PROVIDER={{ .Values.ai.provider }}{{ "\n" }}{{- end }}
-{{- if .Values.ai.addProcessedTag }}ADD_AI_PROCESSED_TAG={{ .Values.ai.addProcessedTag }}{{ "\n" }}{{- end }}
-{{- if .Values.ai.processedTagName }}AI_PROCESSED_TAG_NAME={{ .Values.ai.processedTagName }}{{ "\n" }}{{- end }}
-{{- if .Values.prompt.useTags }}USE_PROMPT_TAGS={{ .Values.prompt.useTags }}{{ "\n" }}{{- end }}
-{{- if .Values.prompt.tags }}PROMPT_TAGS={{ .Values.prompt.tags }}{{ "\n" }}{{- end }}
-{{- if .Values.scanInterval }}SCAN_INTERVAL={{ .Values.scanInterval }}{{ "\n" }}{{- end }}
-{{- if .Values.systemPrompt }}SYSTEM_PROMPT=`{{ .Values.systemPrompt }}`{{ "\n" }}{{- end }}
-{{- if .Values.processPredefinedDocuments }}PROCESS_PREDEFINED_DOCUMENTS={{ .Values.processPredefinedDocuments }}{{ "\n" }}{{- end }}
-TAGS={{ .Values.tags }}{{ "\n" }}
-{{- if .Values.openAi.model }}OPENAI_MODEL={{ .Values.openAi.model }}{{ "\n" }}{{- end }}
-{{- end }}
+{{- if .Values.serviceAccount.create -}}
+    {{ default (include "paperless-ai.fullname" .) .Values.serviceAccount.name }}
+{{- else -}}
+    {{ default "default" .Values.serviceAccount.name }}
+{{- end -}}
+{{- end -}}