maint(linux): make emscripten setup on build agents idempotent
The automatic installation of emscripten on build agents did not work if `EMSCRIPTEN_BASE` was set. This change improves things for a corrupt installation by using `EMSCRIPTEN_BASE` if already set, and by skipping clone if it already exists.
Keyman makes it possible for you to type in any language
on Windows, macOS, Linux, iPhone, iPad, Android tablets and phones, and even
instantly in your web browser. Create keyboard layouts with Keyman Developer and
share them with the community in the keyboards
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Community have so far contributed
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Keyman is an open source project distributed under the MIT license.