ensure newlines in known_hosts (rapidsai#214)

Author: trxcllnt

features/src/utils/install.sh

@@ -120,11 +120,10 @@ append_to_all_bashrcs "$(cat .bashrc)";
 # export envvars in /etc/profile.d
 add_etc_profile_d_script devcontainer-utils "$(cat .bashrc)";
 
-known_hosts="";
 # Add GitHub's key fingerprints to known_hosts
-known_hosts="$(curl -s https://api.github.com/meta | jq -r '.ssh_keys | map("github.com \(.)") | .[]' || echo "")";
 # Add GitLab's key fingerprints to known_hosts (https://docs.gitlab.com/ee/user/gitlab_com/index.html#ssh-known_hosts-entries)
-known_hosts+="$(cat <<EOF
+known_hosts="$(cat <<EOF
+$(curl -s https://api.github.com/meta | jq -r '.ssh_keys | map("github.com \(.)") | .[]' || echo "")
 gitlab.com ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAfuCHKVTjquxvt6CM6tdG4SLp1Btn/nOeHHE5UOzRdf
 gitlab.com ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCsj2bNKTBSpIYDEGk9KxsGh3mySTRgMtXL583qmBpzeQ+jqCMRgBqB98u3z++J1sKlXHWfM9dyhSevkMwSbhoR8XIq/U0tCNyokEi/ueaBMCvbcTHhO7FcwzY92WK4Yt0aGROY5qX2UKSeOvuP4D6TPqKF1onrSzH9bx9XUf2lEdWT/ia1NEKjunUqu1xOB/StKDHMoX4/OKyIzuS0q/T1zOATthvasJFoPrAjkohTyaDUz2LN5JoH839hViyEG82yB+MjcFV5MU3N1l1QL3cVUCh93xSaua1N85qivl+siMkPGbO5xR/En4iEY6K2XPASUEMaieWVNTRCtJ4S8H+9
 gitlab.com ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBFSMqzJeV9rUzU4kWitGjeR4PWSa29SPqJ1fVkhtj3Hw9xjLVXVYrU9QlYWrOLXBpQ6KWjbjTDTdDkoohFzgbEY=