Feat/sign with lab #10

Job	Run time
build (stellar-cli, stellar, ubuntu-20.04, x86_64-unknown-linux-gnu)	14m 45s
build (stellar-cli, stellar, ubuntu-20.04, aarch64-unknown-linux-gnu)	16m 42s
build (stellar-cli, stellar, macos-14, x86_64-apple-darwin)	10m 45s
build (stellar-cli, stellar, macos-12, aarch64-apple-darwin)	18m 8s
build (stellar-cli, stellar, windows-latest, x86_64-pc-windows-msvc, .exe)	17m 59s
build (soroban-cli, soroban, ubuntu-20.04, x86_64-unknown-linux-gnu)	15m 7s
build (soroban-cli, soroban, ubuntu-20.04, aarch64-unknown-linux-gnu)	16m 34s
build (soroban-cli, soroban, macos-14, x86_64-apple-darwin)	10m 52s
build (soroban-cli, soroban, macos-12, aarch64-apple-darwin)	18m 6s
build (soroban-cli, soroban, windows-latest, x86_64-pc-windows-msvc, .exe)	17m 59s
	2h 36m 57s

Provide feedback