Add special case for Fedora, eliminate graphql from common prereqs

scripts/cnode-helper-scripts/prereqs.sh

@@ -117,30 +117,25 @@ if [ "$WANT_BUILD_DEPS" = 'Y' ]; then
     echo "Using apt to prepare packages for ${DISTRO} system"
     echo "  Updating system packages..."
     $sudo apt-get -y install curl > /dev/null
-    curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | $sudo apt-key add - > /dev/null
-    echo "deb https://dl.yarnpkg.com/debian/ stable main" | $sudo tee /etc/apt/sources.list.d/yarn.list > /dev/null
     $sudo apt-get -y update > /dev/null
     echo "  Installing missing prerequisite packages, if any.."
-    pkg_list="libpq-dev python3 build-essential pkg-config libffi-dev libgmp-dev libssl-dev libtinfo-dev systemd libsystemd-dev libsodium-dev zlib1g-dev yarn make g++ tmux git jq wget libncursesw5 gnupg aptitude libtool autoconf secure-delete iproute2 bc tcptraceroute"
+    pkg_list="libpq-dev python3 build-essential pkg-config libffi-dev libgmp-dev libssl-dev libtinfo-dev systemd libsystemd-dev libsodium-dev zlib1g-dev make g++ tmux git jq wget libncursesw5 gnupg aptitude libtool autoconf secure-delete iproute2 bc tcptraceroute"
     $sudo apt-get -y install ${pkg_list} > /dev/null;rc=$?
     if [ $rc != 0 ]; then
       echo "An error occurred while installing the prerequisite packages, please investigate by using the command below:"
       echo "sudo apt-get -y install ${pkg_list}"
       echo "It would be best if you could submit an issue at https://github.com/cardano-community/guild-operators with the details to tackle in future, as some errors may be due to external/already present dependencies"
       exit;
-    else
-      $sudo aptitude install npm -yq > /dev/null
     fi
-  elif [ -z "${OS_ID##*rhel*}" ]; then
+  elif [ -z "${OS_ID##*rhel*}" ] || [[ "${DISTRO}" == *Fedora* ]]; then
     #CentOS/RHEL/Fedora
     echo "Using yum to prepare packages for ${DISTRO} system"
     echo "  Updating system packages..."
     $sudo yum -y install curl > /dev/null
-    curl --silent --location https://dl.yarnpkg.com/rpm/yarn.repo | $sudo tee /etc/yum.repos.d/yarn.repo > /dev/null
-    $sudo rpm --import https://dl.yarnpkg.com/rpm/pubkey.gpg > /dev/null
     $sudo yum -y update > /dev/null
     echo "  Installing missing prerequisite packages, if any.."
-    pkg_list="python3 coreutils pkgconfig libffi-devel gmp-devel openssl-devel ncurses-libs ncurses-compat-libs systemd systemd-devel libsodium-devel zlib-devel npm yarn make gcc-c++ tmux git wget epel-release jq gnupg libtool autoconf srm iproute bc tcptraceroute"
+    pkg_list="python3 coreutils pkgconfig libffi-devel gmp-devel openssl-devel ncurses-libs ncurses-compat-libs systemd systemd-devel libsodium-devel zlib-devel make gcc-c++ tmux git wget jq gnupg libtool autoconf srm iproute bc tcptraceroute"
+    [[ ! "${DISTRO}" == *Fedora* ]] && pkg_list="epel-release $pkg_list"
     $sudo yum -y install ${pkg_list} > /dev/null;rc=$?
     if [ $rc != 0 ]; then
       echo "An error occurred while installing the prerequisite packages, please investigate by using the command below:"