Adds REDIS_USERNAME and REDIS_PASSWORD. Both are optional, so an
unauthenticated instance still works unchanged. Redis 6+ ACL auth takes
both; a legacy requirepass instance takes the password with an empty
username, which is what go-redis needs to send single-argument AUTH.
Admin now defaults to the external Redis at 10.10.10.2:6379 rather than the
compose-local one, and no longer declares depends_on: redis -- it is not
starting that container any more. The base stack keeps its own Redis for
`server`, which still has no auth support.
Also fixes SMTP_PASSWORD in the admin block: it read `$SMTP_PASSWORD:-}`
rather than `${SMTP_PASSWORD:-}`, which appended a literal `:-}` to the
password and would have failed SMTP auth at the first verification email.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Adds admin to docker-compose.site.yml and a fourth Go image to the build
workflow, both following the conventions the other services already use.
LICENSE_SIGNING_KEY now appears in exactly one service in exactly one
compose file. It must never be added to server, and the self-hosted
docker-compose.yml still does not mention admin at all.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>