Document preview environment feature

[data-sync-user]

Let’s add a quick mention of the ability to utilize a preview environment to our docs.

https://mozilla-hub.atlassian.net/wiki/spaces/CLOUDSERVICES/pages/1039204374/Sync+service+developer+documentation might be the place for this. Probably just a simple mention of the preview label and a link to https://mozilla-hub.atlassian.net/wiki/spaces/SRE/pages/1695351125/How+to+Enabling+preview+environments would suffice.

┆Issue is synchronized with this Jira Task

[data-sync-user]

➤ Philip Jenvey commented:

Some of the content from Taddes' recent message would be helpful to include in docs:

https://mozilla.slack.com/archives/CK6MA5133/p1773865791166909 ( https://mozilla.slack.com/archives/CK6MA5133/p1773865791166909|smart-card )

Big thanks to @dlactin ( https://mozilla.enterprise.slack.com/team/U02094S19HA ) for getting our Tokenserver ephemeral env across the finish line! Sharing some context here for those who want to peek:

• Webservices-infra update:  https://github.com/mozilla/webservices-infra/pull/10098 ( https://github.com/mozilla/webservices-infra/pull/10098|smart-link )
• Preview Argo env https://sandbox.argocd.global.mozgcp.net/applications/argocd-sandbox/preview-sync-pr-2135-tokenserver?view=tree&conditions=false&resource= ( https://sandbox.argocd.global.mozgcp.net/applications/argocd-sandbox/preview-sync-pr-2135-tokenserver?view=tree&conditions=false&resource= )
• heartbeat a-ok:  https://pr2135-tokenserver.preview.mozilla.cloud/__heartbeat__ ( https://pr2135-tokenserver.preview.mozilla.cloud/__heartbeat__ )
• New parameter for the mozcloud image tag update https://github.com/mozilla/global-platform-admin/pull/5787 ( https://github.com/mozilla/global-platform-admin/pull/5787|smart-link )