Only install clang-format if it is really missing #136
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As the default image already has v10, v11 (default) and v12 installed, you don't have to install v8 and don't even use it. This removes the need for a long (most of the time 2 minutes) mirror search or even call
apt-get install
in the first place. This shortens the time spent inactions_install.sh
from about 2:30min to 6s, which is 25x faster.This is similar to PR #135, but wraps it in a conditional: if the search for
/usr/bin/clang-format
fails, install it. This should be fully backwards compatible.This is the output of

clang-format --version
with this change:This as it was before:

There is no difference, as both times the defaut
clang-format
gets used.