Nextcloud gets 502 Bad Gateway on watchtower update

[SebastianRzk]

Problem:

When using upstream in the nginx config, the ip for app is resolved once. So if the app container gets updated (e.g. through watchtower, the ip changes and the server php-handler is not reachable anymore.

Fix:

• Add docker dns as resovler
• replace upstream with variable (set), to trigger the dns lookup

My solution: #2413

Source / Inspiration:

bug on the watchtower github

[J0WI]

The issue is not related to this image but I left a comment in https://github.com/nextcloud/docker/pull/2413#issuecomment-2815487622

[joshtrichards]

Closing via #2413