Merge ~mthaddon/charm-k8s-mattermost/+git/charm-k8s-mattermost:default-image-5.33 into charm-k8s-mattermost:master

[Tom Haddon]

Use image built from the OCI recipe on Launchpad and update readme to use preferred 'relate' for adding a relation

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

This merge proposal is being monitored by mergebot. Change the status to Approved to merge.

[🤖 prod-jenkaas-is (prod-jenkaas-is)]

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[🤖 prod-jenkaas-is (prod-jenkaas-is)]

PASSED: Continuous integration, rev:328ef0846fe95d1bae2224b8c73b85ed385cab19
https://jenkins.canonical.com/is/job/lp-charm-k8s-mattermost-ci/5/
Executed test runs:
    SUCCESS: https://jenkins.canonical.com/is/job/lp-charm-test/69/
    None: https://jenkins.canonical.com/is/job/lp-update-mp/79227/

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review: Approve (continuous-integration)

[Junien F (axino)]

+1

review: Approve

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

Change successfully merged at revision c0032d3c8c1c009ffc9dc8107599031f20dcae78

diff --git a/README.md b/README.md
index e244a37..461b0f7 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ Kubernetes model:
 
     juju deploy cs:~postgresql-charmers/postgresql-k8s postgresql
     juju deploy cs:~mattermost-charmers/mattermost --config juju-external-hostname=foo.internal
-    juju add-relation mattermost postgresql:db
+    juju relate mattermost postgresql:db
     juju expose mattermost
 
 Once the deployment has completed and the "mattermost" workload state in `juju
diff --git a/config.yaml b/config.yaml
index 4716b7c..5827200 100644
--- a/config.yaml
+++ b/config.yaml
@@ -42,7 +42,7 @@ options:
           Switching to a newer image version will initiate an upgrade of Mattermost.
 
           This setting is required.
-        default: mattermostcharmers/mattermost:5.33.3
+        default: mattermostcharmers/mattermost:v5.33.3-20.04_edge
     mattermost_image_username:
         type: string
         description: |