[stable/ghost] Release 2.1.8 (#3332)

* ghost: update to `bitnami/ghost:1.19.2-r1`

* ghost: bump chart version to `2.1.8`

* adds OWNERS file

stable/ghost/Chart.yaml

@@ -1,5 +1,5 @@
 name: ghost
-version: 2.1.7
+version: 2.1.8
 appVersion: 1.19.2
 description: A simple, powerful publishing platform that allows you to share your
   stories with the world

stable/ghost/OWNERS

@@ -0,0 +1,8 @@
+approvers:
+- prydonius
+- tompizmor
+- sameersbn
+reviewers:
+- prydonius
+- tompizmor
+- sameersbn

stable/ghost/values.yaml

@@ -1,7 +1,7 @@
 ## Bitnami Ghost image version
 ## ref: https://hub.docker.com/r/bitnami/ghost/tags/
 ##
-image: bitnami/ghost:1.19.2-r0
+image: bitnami/ghost:1.19.2-r1
 
 ## Busybox image used to configure volume permissions
 ##