Remove unnecessary files from image (#481) #354

Job	Run time
amd64 / build-stellar-core	27m 49s
amd64 / build-stellar-horizon	2m 44s
amd64 / build-stellar-friendbot	1m 6s
amd64 / build-stellar-soroban-rpc	1m 44s
arm64 / build-stellar-core	3h 3m 51s
arm64 / build-stellar-horizon	9m 56s
arm64 / build-stellar-soroban-rpc	4m 49s
arm64 / build-stellar-friendbot	3m 33s
amd64 / build	3m 17s
amd64 / test (testnet)	2m 50s
amd64 / test (pubnet)	1m 34s
amd64 / test (standalone)	1m 44s
amd64 / test (standalone, --enable-horizon-captive-core)	1m 42s
amd64 / push-pr	0s
amd64 / push-release	48s
arm64 / build	7m 4s
arm64 / test (testnet)	12m 30s
arm64 / test (pubnet)	1m 34s
arm64 / test (standalone)	2m 7s
arm64 / test (standalone, --enable-horizon-captive-core)	2m 13s
arm64 / push-pr	0s
arm64 / push-release	1m 1s
manifest / push	11s
complete	1s
	4h 34m 8s

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