Create install

Author: ESKKO420

Helper/install

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+set -e
+
+export DEBIAN_FRONTEND=noninteractive
+apt-get -y install gnupg1 rsync wget
+wget -qO - https://apt.stellar.org/SDF.asc | apt-key add -
+echo "deb https://apt.stellar.org focal stable" >/etc/apt/sources.list.d/SDF.list
+echo "deb https://apt.stellar.org focal unstable" >/etc/apt/sources.list.d/SDF-unstable.list
+apt-get update
+apt-get install -y stellar-core=${STELLAR_CORE_VERSION}
+apt-get install -y stellar-horizon=${HORIZON_VERSION}
+apt-get clean
+echo "\nDone installing stellar-core and horizon...\n"