Docker build fails

[erwindon]

Describe the bug
Docker build commands fails

To Reproduce
Steps to reproduce the behaviour:
I went to this folder:
cd SaltGUI/docker/dockerfiles
and ran:
docker build -f dockerfile-saltmaster --tag erwindon/saltgui-saltmaster:3007.1 .
and got this error:
=> ERROR [ 5/12] RUN curl -fsSL -o /etc/apt/keyrings/salt-archive-keyring-2023.gpg https://repo.saltproject.io/salt/py3/ubuntu/22.04/amd64/SALT-PROJECT-G 0.8s

Expected behaviour
successful build

Additional context
I think the reason for failure is the repo.saltproject.io domain does no longer exist and has migrated to packages.broadcom.com

related link:
https://saltproject.io/blog/salt-project-package-repo-migration-and-guidance/

[erwindon]

I'll update this (later).
Coincidentally, I started migrating the SaltGUI test-lab (which is not on GitHub) just a few days ago.
I'm now working on the following migrations, sequentially:

1. SaltStack 3006/3007 versions (update: done)
   using packages.broadcom.com
2. older SaltStack versions
   using archive.repo.saltproject.io.turtletraction.com (update: never mind, that archive is incomplete)
3. unsupporting any now missing SaltStack versions
   e.g. from 3000-3005 or from 2014-2019 or even from 0.6-0.17 (update: now unsupporting all of these)
4. the docker-testset in the SaltGui repo (as also raised in this ticket)
5. any other details in the SaltGui repo (update: did not find anything else)

[erwindon]

several files to be updated:

• docker/README.md
• docker/dockerfiles/dockerfile-saltminion-debian
• docker/dockerfiles/dockerfile-saltminion-ubuntu
• docker/dockerfiles/dockerfile-saltminion-centos
• docker/dockerfiles/dockerfile-saltmaster

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[erwindon]

@MrSmiler
I've converted this issue into a PR, based on changes in a new branch that I created.
The dockerfiles in this branch are updated.
The resulting docker images have been uploaded to docker-hub.
Can you please review the changes before I merge them?

[erwindon]

@MrSmiler
do you have the opportunity to look at this PR?

[MrSmiler]

I checked and built the docker files, everything is good