Add the python-is-python3 package to be able to run sourced python3 scripts
that are written with the expectation that `python` command is symlink to
python3.

Signed-off-by: Daniel P. Smith <[email protected]>

There was no need to have the quilt files in the directory structure that they
were in. This moves them into a generic files directory. A second issue is that
the files were hardcoded to install into the home dir for user "build". This
gets corrected to use the `$UNAME` build variable.

Signed-off-by: Daniel P. Smith <[email protected]>

The repo tool was being downloaded from a http url and not an https url.

Signed-off-by: Daniel P. Smith <[email protected]>

This adds a two steps that will allow having private CA chains to be copied
into the container and installed in the system CA store.

Signed-off-by: Daniel P. Smith <[email protected]>