Add docker image #988

Job	Run time
build (stellar-cli, stellar, ubuntu-20.04, x86_64-unknown-linux-gnu)	15m 4s
build (stellar-cli, stellar, ubuntu-20.04, aarch64-unknown-linux-gnu)	16m 36s
build (stellar-cli, stellar, macos-14, x86_64-apple-darwin)	10m 21s
build (stellar-cli, stellar, macos-12, aarch64-apple-darwin)	19m 50s
build (stellar-cli, stellar, windows-latest, x86_64-pc-windows-msvc, .exe)	20m 35s
build (soroban-cli, soroban, ubuntu-20.04, x86_64-unknown-linux-gnu)	14m 47s
build (soroban-cli, soroban, ubuntu-20.04, aarch64-unknown-linux-gnu)	16m 14s
build (soroban-cli, soroban, macos-14, x86_64-apple-darwin)	11m 2s
build (soroban-cli, soroban, macos-12, aarch64-apple-darwin)	26m 30s
build (soroban-cli, soroban, windows-latest, x86_64-pc-windows-msvc, .exe)	21m 48s
	2h 52m 47s

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