Automate adding secret env vars to versions on test & release

[metalwarrior665]

Currently, we set env vars manually for both latest and 0.99 (test). This can cause critical breakdown in production if someone adds the evn var only to 0.99 so tests pass but then it is missing in latest and crashes in production

[metalwarrior665]

Not having this caused a recent short outage for Quilt using custom Instagram build
https://apify.slack.com/archives/C06NSFT6NQZ/p1773741624887209

[metalwarrior665]

We could also use Doppel like platform team so let's evaluate pros n cons