LGA-1347 Maintenance page

[said-moj]

What does this pull request do?

• Adds maintenance mode environment variable
• Adds a before_request action that when maintenance mode is enabled redirects ALL traffic to the /maintenance page.

Any other changes that would benefit highlighting?

When not in maintenance mode if someone goes to /maintenance then they will be redirected to /start

Checklist

• Provided JIRA ticket number in the title, e.g. "LGA-152: Sample title"

[exonian]

I'm wondering if there's any merit in trying to redirect back from /maintenance when we're not in maintenance mode. I know it's a bit of a pet peeve of mine to be shunted to one of these pages and know that refreshing won't help any, but it might not be a big enough user issue to actually do.

(I'll look at the code properly after standup)

[said-moj]

I'm wondering if there's any merit in trying to redirect back from /maintenance when we're not in maintenance mode. I know it's a bit of a pet peeve of mine to be shunted to one of these pages and know that refreshing won't help any, but it might not be a big enough user issue to actually do.

(I'll look at the code properly after standup)

Wow this is actually a something I haven't considered. Definitely sounds like a bug to me, i'll add.

Good catch