Fix ghost chart (#7097)

stable/ghost/Chart.yaml

@@ -1,5 +1,5 @@
 name: ghost
-version: 4.0.13
+version: 4.0.14
 appVersion: 1.25.3
 description: A simple, powerful publishing platform that allows you to share your
   stories with the world

stable/ghost/templates/deployment.yaml

@@ -48,8 +48,10 @@ spec:
         {{- else }}
           value: {{ .Values.externalDatabase.host | quote }}
         {{- end }}
-        {{- if and (not .Values.mariadb.enabled) .Values.externalDatabase.port }}
         - name: MARIADB_PORT_NUMBER
+        {{- if .Values.mariadb.enabled }}
+          value: "3306"
+        {{- else }}
           value: {{ .Values.externalDatabase.port | quote }}
         {{- end }}
         - name: GHOST_DATABASE_NAME