When run inside of a Docker container, remote doesn't work

[schnow265]

I run this mod on a containerized minecraft server, and every time I try to do a full backup using /backup full, the following error appears in my logs:

Dec 30 12:24:04 snowbox systemd-mcsvr[3276]: Caused by: org.eclipse.jgit.errors.TransportException: <my repo URL>: Authentication is required but no CredentialsProvider has been registered
Dec 30 12:24:04 snowbox systemd-mcsvr[3276]:         at org.eclipse.jgit.transport.TransportHttp.connect(TransportHttp.java:689) ~[org_eclipse_jgit_org_eclipse_jgi309050840-r-1a9754f2407afcf8.jar:?]
Dec 30 12:24:04 snowbox systemd-mcsvr[3276]:         at org.eclipse.jgit.transport.TransportHttp.openFetch(TransportHttp.java:467) ~[org_eclipse_jgit_org_eclipse_jgi309050840-r-1a9754f2407afcf8.jar:?]
Dec 30 12:24:04 snowbox systemd-mcsvr[3276]:         at org.eclipse.jgit.api.LsRemoteCommand.execute(LsRemoteCommand.java:170) ~[org_eclipse_jgit_org_eclipse_jgi309050840-r-1a9754f2407afcf8.jar:?]
Dec 30 12:24:04 snowbox systemd-mcsvr[3276]:         at org.eclipse.jgit.api.LsRemoteCommand.call(LsRemoteCommand.java:131) ~[org_eclipse_jgit_org_eclipse_jgi309050840-r-1a9754f2407afcf8.jar:?]
Dec 30 12:24:04 snowbox systemd-mcsvr[3276]:         at net.pcal.fastback.repo.PushUtils.doPush(PushUtils.java:87) ~[fastback-0.15.6+1.20.1-fabric.jar:?]
Dec 30 12:24:04 snowbox systemd-mcsvr[3276]:         ... 8 more

When I do a exec -it into the container to get to a shell, I can git push manually with my stored credentials.

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Output of /backup info:

FastBack Info
-------------
FastBack version: 0.15.6+1.20.1-fabric
native git installed: true   
git: git version 2.43.0   
git-lfs: git-lfs/3.6.0 (GitHub; linux amd64; go 1.23.1)
Backup UUID: qVLD
World size: 434 MB
Local backup size: 551 MB
backup-enabled = true
remote-url = <my repo URL>
restore-directory = null
native-git-enabled = true
autoback-wait = 0
mods-backup-enabled = false
broadcast-enabled = true
broadcast-message = null
Shutdown action: full
Autoback action: none
No snapshot retention policy set.
No remote snapshot retention policy set.