Adds StatefulSet support (#549)

* Adds StatefulSet support

# Conflicts:
#	helm/opengist/templates/pvc.yaml

* Adds statefulset support for replicaCount gt 1

* Improves the setup of multiple replicas in a stateful set

* Adds config wrangling logic to the secret template

* Adds shared PV functionality

* Adds missing pvc-shared template

* Adds stateful set and documentation

---------

Co-authored-by: Guillem Riera <guillem@rieragalm.es>

helm/opengist/templates/secret.yaml

@@ -1,4 +1,53 @@
 {{- if (not .Values.configExistingSecret) }}
+{{- $cfg := deepCopy .Values.config }}
+{{- /* Backward compatibility: map db-uri (deprecated) to db-uri key still expected by app, also accept dbUri coming from user */}}
+{{- if and (hasKey $cfg "dbUri") (not (hasKey $cfg "db-uri")) }}
+  {{- $_ := set $cfg "db-uri" (index $cfg "dbUri") }}
+{{- end }}
+{{- $dburi := default "" (index $cfg "db-uri") }}
+{{- /* Flatten possible nested index.meili.* structure if user passed --set config.index.meili.host=... */}}
+{{- if and (hasKey $cfg "index") (kindIs "map" (index $cfg "index")) }}
+  {{- $indexMap := (index $cfg "index") }}
+  {{- if hasKey $indexMap "type" }}
+    {{- $_ := set $cfg "index" (index $indexMap "type") }}
+  {{- end }}
+  {{- if hasKey $indexMap "meili" }}
+    {{- $meili := (index $indexMap "meili") }}
+    {{- if hasKey $meili "host" }}
+      {{- $_ := set $cfg "index.meili.host" (index $meili "host") }}
+    {{- end }}
+    {{- if hasKey $meili "api-key" }}
+      {{- $_ := set $cfg "index.meili.api-key" (index $meili "api-key") }}
+    {{- end }}
+  {{- end }}
+{{- end }}
+{{- if and .Values.postgresql.enabled (eq $dburi "") }}
+  {{- $user := default "" .Values.postgresql.global.postgresql.auth.username }}
+  {{- $pass := default "" .Values.postgresql.global.postgresql.auth.password }}
+  {{- $db := default "" .Values.postgresql.global.postgresql.auth.database }}
+  {{- $port := default 5432 .Values.postgresql.global.postgresql.service.ports.postgresql }}
+  {{- if or (eq $user "") (eq $pass "") (eq $db "") }}
+    {{- fail "postgresql.enabled=true requires username/password/database (postgresql.global.postgresql.auth.*) or set config.db-uri manually" }}
+  {{- end }}
+  {{- $autoHost := printf "%s-postgresql" (include "opengist.fullname" .) }}
+  {{- $autoUri := printf "postgres://%s:%s@%s:%d/%s" $user $pass $autoHost $port $db }}
+  {{- $_ := set $cfg "db-uri" $autoUri }}
+{{- end }}
+{{- $replicas := int .Values.replicaCount }}
+{{- $index := default "" (index $cfg "index") }}
+{{- /* Auto-set Meilisearch host if subchart enabled and host missing */}}
+{{- $meiliHost := default "" (index $cfg "index.meili.host") }}
+{{- if and .Values.meilisearch.enabled (eq $meiliHost "") }}
+  {{- $autoMeiliHost := printf "http://%s-meilisearch:7700" (include "opengist.fullname" .) }}
+  {{- $_ := set $cfg "index.meili.host" $autoMeiliHost }}
+  {{- if or (eq $index "") (ne $index "meilisearch") }}
+    {{- $_ := set $cfg "index" "meilisearch" }}
+    {{- $index = "meilisearch" }}
+  {{- end }}
+{{- end }}
+{{- if and (gt $replicas 1) (or (eq $index "") (eq $index "bleve")) }}
+  {{- fail "replicaCount>1 requires index set to 'meilisearch' (bleve not supported with multiple replicas)" }}
+{{- end }}
 apiVersion: v1
 kind: Secret
 metadata:
@@ -9,5 +58,5 @@ metadata:
 type: Opaque
 stringData:
   config.yml: |-
-    {{- .Values.config | toYaml | nindent 4 }}
+    {{- $cfg | toYaml | nindent 4 }}
 {{- end }}