update README with example

README.md

@@ -1,20 +1,109 @@
 # Mastodon Image for OpenShift
 
 This repository contains a `Dockerfile` which modifies the [upstream](https://hub.docker.com/r/tootsuite/mastodon) image to be compatible with OpenShift.
-As usual, it's a permission thingy.
+As usual, it's a file permission thingy.
 
 Read more [here](https://docs.openshift.com/container-platform/4.11/openshift_images/create-images.html#images-create-guide-openshift_create-images) about why this is needed on OpenShift.
 
-Get the image on [ghcr.io](https://github.com/appuio/mastodon-openshift/pkgs/container/mastodon-openshift%2Fmastodon):
-
-```
-docker pull ghcr.io/appuio/mastodon-openshift/mastodon:latest
-```
+Get the image on [ghcr.io](https://github.com/appuio/mastodon-openshift/pkgs/container/mastodon-openshift%2Fmastodon).
 
 ## Image Maintenance
 
-TODO Renovate and GitHub Action
+The image is automatically rebuilt once a new upstream Mastodon image gets available.
+Thanks to `renovate.json` and the GitHub Action pipeline.
 
 ## Helm Values
 
-TODO add an example for the [upstream Chart](https://github.com/mastodon/mastodon/tree/main/chart)
+Here is an example for the [upstream Chart](https://github.com/mastodon/mastodon/tree/main/chart) which works on OpenShift.
+It's neither optimized nor perfect, but it works:
+
+```yaml
+replicaCount: 1
+
+image:
+  repository: ghcr.io/appuio/mastodon-openshift/mastodon
+  tag: v4.0.2
+  pullPolicy: IfNotPresent
+
+mastodon:
+  createAdmin:
+    enabled: true
+    username: theadmin
+    email: [email protected]
+  local_domain: mastodon.local
+  persistence:
+    assets:
+      accessMode: ReadWriteMany
+      storageClassName: cephfs-fspool-cluster
+      resources:
+        requests:
+          storage: 10Gi
+    system:
+      accessMode: ReadWriteMany
+      storageClassName: cephfs-fspool-cluster
+      resources:
+        requests:
+          storage: 10Gi
+  secrets:
+    secret_key_base: CHANGEME
+    otp_secret: CHANGEME
+    vapid:
+      private_key: CHANGEME
+      public_key: CHANGEME
+  smtp:
+    auth_method: plain
+    delivery_method: smtp
+    domain: mastodon.local
+    enable_starttls: 'auto'
+    from_address: [email protected]
+    openssl_verify_mode: peer
+    port: 587
+    reply_to: [email protected]
+    server: CHANGEME
+    tls: false
+    login: CHANGEME
+    password: CHANGEME
+
+ingress:
+  enabled: true
+  annotations:
+    cert-manager.io/cluster-issuer: letsencrypt-production
+  hosts:
+    - host: mastodon.local
+      paths:
+        - path: '/'
+  tls:
+    - secretName: ingress-tls
+      hosts:
+        - mastodon.local
+
+podSecurityContext: null
+securityContext: null
+
+## Services
+elasticsearch:
+  enabled: false
+
+postgresql:
+  enabled: true
+  auth:
+    database: mastodon_production
+    username: mastodon
+    password: CHANGEME
+  primary:
+    podSecurityContext:
+      enabled: false
+    containerSecurityContext:
+      enabled: false
+
+redis:
+  password: CHANGEME
+  architecture: standalone
+  master:
+    persistence:
+      size: "1Gi"
+    podSecurityContext:
+      enabled: false
+    containerSecurityContext:
+      enabled: false
+```