Select the current config based on $ARCH value and thus rename
the existing config to config-latest.$ARCH.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
github action grouping is broken because we were outputing "::endgroup" where
it needs "::endgroup::". This patch also added some addtional grouping around
contianer setup phase, making output easier to read.