CI Fix, main branch (2024.08.27.)

This is an attempt to finally figure out what is going on with the CI of the repository.

At the same time updated the documentation a little. Bringing it up to date with the current status quo.

added 1 commit

• 356da893 - Trying to get extra info about the runners.

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added 1 commit

• f5566fbe - Limited the build to 8 parallel processes.

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merged

mentioned in commit 8c0d261e

mentioned in merge request !1143 (merged)

mentioned in commit jchapman/atlasexternals@0798d2a5

mentioned in merge request !1174 (merged)