[7.17] [ci] Cache chromedriver (#196614) #197230
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Chromedriver is currently downloaded at runtime on each agent. We know the expected version of Chrome at image build time, and can re-use the matching driver already installed instead. This sets `XDG_CACHE_HOME` to `$HOME/.cache` to persist the chromedriver installation. Details on the specification can be found at https://specifications.freedesktop.org/basedir-spec/latest/. Other packages, including cypress, playwright, bazelisk and yarn also respect this environment variable, but are already falling back to the `$HOME/.cache` directory. This also removes `CHROMEDRIVER_FORCE_DOWNLOAD`, which I believe is an artifact of legacy code: https://github.com/elastic/kibana/blob/6.7/.ci/packer_cache.sh#L17-L26. At one point node_modules was initially loaded from an archive to speed up bootstrap times. The intent was to redownload chromedriver because the Chrome version on the agent image was upgraded independently of the bootstrap cache, potentially causing version mismatches. The impact of re-downloading was also less significant, as there was less parallelization in favor of large machines running parallel jobs. (cherry picked from commit b89941f)
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cc @jbudz |
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Backport
This will backport the following commits from
mainto7.17:Questions ?
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