slack WATCHTOWER_NOTIFICATION_SLACK_IDENTIFIER not being used

[stoneobscurity]

Describe the bug

the WATCHTOWER_NOTIFICATION_SLACK_IDENTIFIER is not being used when it posts to slack.

Steps to reproduce

it's never worked. on multiple ubuntu+docker systems.

Expected behavior

it does not show the hostname i put in WATCHTOWER_NOTIFICATION_SLACK_IDENTIFIER.

Screenshots

No response

Environment

ubuntu 20.24, 22.04
latest docker/container.

Your logs

time="2024-05-08T12:16:07-05:00" level=info msg="Found new lscr.io/linuxserver/unifi-network-application:latest image (6ca28e718e93)"
time="2024-05-08T12:16:12-05:00" level=info msg="Stopping /unifi (352feb6ab4cf) with SIGTERM"
time="2024-05-08T12:16:23-05:00" level=info msg="Creating /unifi"
time="2024-05-08T12:16:24-05:00" level=info msg="Removing image 2e7d62d0c2eb"
time="2024-05-08T12:16:26-05:00" level=info msg="Session done" Failed=0 Scanned=18 Updated=1 notify=no

Additional context

No response

[github-actions]

Hi there! 👋🏼 As you're new to this repo, we'd like to suggest that you read our code of conduct as well as our contribution guidelines. Thanks a bunch for opening your first issue! 🙏