Increase size of NGINX persistent storage to 10Gi

This is the size limit currently set by the largest library site. Make
this the default for all sites.

We currently do not have a good way to set individual size limits per
site. This has created a suboptimal workflow where the site in
question has to be updated manually after each workflow for the
deployment to complete.

We could introduce a way to control this per site in sites.yaml but it
would not provide much value. We pay for storage used - not reserved.
Consequently increasing the limit for all sites should not increase
costs considerably until it is actually used.

All this in mind we increase the size of the the persistent storage
for the Lagoon default of 5Gb to 10Gb.
https://docs.lagoon.sh/concepts-basics/docker-compose-yml/#persistent-storage

infrastructure/dpladm/env-repo-template/standard/docker-compose.yml

@@ -31,6 +31,7 @@ services:
     labels:
       lagoon.type: nginx-php-persistent
       lagoon.persistent: /app/web/sites/default/files/ # define where the persistent storage should be mounted too
+      lagoon.persistent.size: 10Gi
     environment:
       << : *default-environment # loads the defined environment variables from the top