Fix first-run blockers on Linux/macOS + clarify image upgrade procedure#1

Z-Blocks merged 5 commits into

lightchain-protocol:mainlightchain-protocol/lightchain-worker-toolkit:mainfrom

DimitarTAtanasov:fix/env-sh-silent-failure-on-first-runDimitarTAtanasov/lightchain-worker-toolkit:fix/env-sh-silent-failure-on-first-runCopy head branch name to clipboard