Feature request: Possibility to have currently not available values in the SERVER_* environment variables

[ioqy]

What's the feature 🧐

Allow invalid values in the following environment variables so that it's possible to have a list of preferred values and if a value is not found in the servers.json it is just ignored and another value is used.

• SERVER_COUNTRIES
• SERVER_REGIONS
• SERVER_CITIES
• SERVER_NAMES
• SERVER_HOSTNAMES
• ISP

Extra information and references

Background to my problem:

On multiple occasions I had the problem with AirVPN that servers where missing from the servers.json file and the gluetun would hang in a restart loop and could not establish a connection even though the server where listed on their websites. In the past the reason for this was that the country only had one server and it was temporarily offline. Today it was a region with multiple servers that was just missing from the servers.json even though it was listed on the website.

[github-actions]

@qdm12 is more or less the only maintainer of this project and works on it in his free time.
Please:

• do not ask for updates, be patient
• 👍 the issue to show your support instead of commenting
  @qdm12 usually checks issues at least once a week, if this is a new urgent bug,
  revert to an older tagged container image

[qdm12]

Please see #2419 and try image qmcgaw/gluetun:pr-2419 to check it fits your needs?

[ioqy]

Yes, works great.

Thanks for the quick implementation.

[github-actions]

Closed issues are NOT monitored, so commenting here is likely to be not seen.
If you think this is still unresolved and have more information to bring, please create another issue.

This is an automated comment setup because @qdm12 is the sole maintainer of this project
which became too popular to monitor issues closed.

[github-actions]

Closed issues are NOT monitored, so commenting here is likely to be not seen.
If you think this is still unresolved and have more information to bring, please create another issue.

This is an automated comment setup because @qdm12 is the sole maintainer of this project
which became too popular to monitor issues closed.