azure: docker: set up HOME variable to fix Coverity buildspks/coverity-fix-sudo

In commit 01a834066 (azure: docker: fix ARM builds by replacing gosu(1),
2020-02-18), we've switched our entrypoint from gosu(1) to use sudo(1)
instead to fix our ARM builds. The switch introduced an incompatibility
that now causes our Coverity builds to fail, as the "--preserve-env"
switch will also keep HOME at its current value. As a result, Coverity
now tries to set up its configuration directory in root's home
directory, which it naturally can't write to.

Fix the issue by adding the "--set-home" flag to sudo(1).

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