Use ccpi channel instead of tomography mirror in actions

[lauramurgatroyd]

Description

Using the ccpi channel instead of the tomography mirror as we had problems with timeout errors - see #2308

The ccpi channel usage instead seems to resolve or minimise time out issues

Example Usage

Contribution Notes

• The content of this Pull Request (the Contribution) is intentionally submitted for inclusion in CIL (the Work) under the terms and conditions of the Apache-2.0 License
• I confirm that the contribution does not violate any intellectual property rights of third parties

Changes

Testing you performed

Please add any demo scripts to https://github.com/TomographicImaging/CIL-Demos/tree/main/misc
Ran all tests and it passed first time: https://github.com/TomographicImaging/CIL/actions/runs/24522518083

Related issues/links

Checklist

• I have performed a self-review of my code
• I have added docstrings in line with the guidance in the developer guide
• I have updated the relevant documentation
• I have implemented unit tests that cover any new or modified functionality
• CHANGELOG.md has been updated with any functionality change
• Request review from all relevant developers

[lauramurgatroyd]

The first time the actions ran on this PR we had one failure - the docs action. This is not the action we have been having problems with in #2308
The issue was:
urllib.error.URLError: <urlopen error [Errno 110] Connection timed out>
make: *** [Makefile:32: dirhtml] Error 1
Error: Process completed with exit code 2.

No issues on rerunning.

When running all of the tests (like would be done if merged to master), everything passed first time! Which I have not been able to achieve on master or on any other branch that uses the tomography mirror instead of the ccpi channel. Therefore I suggest we merge this.

The all-tests run:
https://github.com/TomographicImaging/CIL/actions/runs/24522518083