Move git revision to environment variable, remove docs, reference runbook
Move git revision to environment variable, remove docs, reference runbook

Closes: #4230
Approved by: sausagee

aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,libra/libra,aptos-labs/aptos-core,libra/libra,libra/libra,aptos-labs/aptos-core,libra/libra