Make it easy to update the Tor Browser testsuite bundle
In the testsuite bundle, we have an update-tbb-testsuite script which is fetching and checking out the latest git commit, after verifying its signature. If a new bundle containing new dependencies is required to run the testsuite, a message is displayed asking the user to download the new bundle.
We should automate the download of the new bundle, signature verification and installation.
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