Add named sizes table (tiny/small/medium/large)

templates/_helpers.tpl

@@ -18,6 +18,18 @@ app.kubernetes.io/version: {{ .Values.odoo.tag | quote }}
 odoosky.io/component: instance
 {{- end -}}
 
+{{/*
+Resources for a given role (`odoo` | `postgres`), looked up against
+the `sizes` table by `instance.size`. Falls back to "small" if the
+operator picked a name that doesn't exist (defensive: a typo
+shouldn't blow up the rendered chart).
+*/}}
+{{- define "instance.resources" -}}
+{{- $size := .Values.instance.size | default "small" -}}
+{{- $cfg := index .Values.sizes $size | default (index .Values.sizes "small") -}}
+{{- toYaml (index $cfg .role) -}}
+{{- end -}}
+
 {{/*
 Postgres password. Looks up the existing Secret on upgrades; uses
 .Values.postgres.password if set; otherwise generates a 32-char