Ability to default envs

[syahnur197]

Would be nice if we have the ability to specify the default the env

for example

in our .bru file

vars {
    url {{process.env.LOCAL_URL ?? 'https://locahost'}}
}

This will ensure the request still work even though if the variable is missing in .env file.

[peteruithoven]

Related:

• The last selected environment is not persisted across app startups #1598
• Allow setting a default environment #2170