Set the server's public URL from KEEPORG_EXTERNAL_URL

The image passes neither -config nor -url, so a deployment had no way to
set external_url and the server built invite links, device-approval pages
and the OIDC redirect URI on http://localhost:8765. The variable overrides
the configuration file and -url overrides it. The deployment values set it
to https://keeporg.tiredsysadmin.cc.

Also document every environment variable the server reads, and the
standard proxy and CA variables it honours for OIDC.

Server version 0.8.0.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packaging/deb/server/changelog

@@ -1,3 +1,11 @@
+keeporgd (0.8.0) unstable; urgency=medium
+
+  * The public base URL can be set with the KEEPORG_EXTERNAL_URL 
+    environment variable. It overrides external_url in the configuration 
+    file; -url overrides it.
+
+ -- Azer Abdullaev <github@reactorcoremeltdown.anonaddy.com>  Mon, 02 Nov 2026 12:37:29 +0100
+
 keeporgd (0.7.0) unstable; urgency=medium
 
   * Deleting a database now requires the caller's own account password