[webgui] testing /snap/bin/chromium #18311
Merged
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Partially resolves https://root-forum.cern.ch/t/63182/
Let use snap installation of chromium on the platform where pre-compiled ROOT version is used
Also add special handling of temporary directory.
snap version of chromium has limitation that files from
/tmp
cannot be accessed. Therefore if TMPDIR is not set, try to use directly home directory.
Adjust batch code to use new functionality with temp directory
Delete temporary HTML file as soon as connection is established