[aci-tester] switch to maintained bats-core v1.1.0

change gentoo mirror for bootstrap in examples

ld_preload systemd-nspawn in stage2 prepare

bump alpine apk version

fix panic on templater with fail result

support quotes in ACI_EXEC on tests using escapes

Fix command when no directory exists

Improve attribute merger error handling

fix pull policy name from none to never

bump alpine apk static

[#255] add cp command

[#254] support updating files dir while running update command

Check if aci is already in the nexus before push + rewrit of push in pure golang

revert fixing version to some examples

store-only on config and cli. use builder's dependencies