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Draft: feat: add `mount` component

Matthew Clarkson requested to merge mount into main

Used to support GitLab CI runners that provide a persistent mount between jobs.

This can vastly speed up Bazel execution.

Bazel 8.3+ can use --repo_contents_cache to concurrently share the cached contents.

Set CI_PERSISTENT_CACHE_DIR in the GitLab CI variables to use. This is best set in the UI as it can change temporarily and should not be baked into the .gitlab-ci.yml.

As of this merge request our persistent-mount runners have a mount at /mnt/cache. We set CI_PERSISTENT_CACHE_DIR to /mnt/cache in GitLab.

Edited by Matthew Clarkson

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