GUACAMOLE-374: Restore support for legacy Docker links. #1021
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These changes add a new
entrypoint.d/000-migrate-docker-links.sh
script that migrates environment variables coming from the following Docker links:guacd
mysql
postgres
sqlserver
That's the entire list of all Docker links we've ever supported historically. Any other variables that may be from other Docker links are untouched.
The migration intentionally occurs before the general deprecated environment variable migration script, as
POSTGRES_PORT
can be either from direct usage of that deprecated environment variable or from a deprecated Docker link.