feat(install): Add mono support for RHEL 8 (#2306)

Co-authored-by: Frisa <digimoncn@gmail.com>

lgsm/functions/check_deps.sh

@@ -56,7 +56,10 @@ fn_install_mono_repo(){
 					monoautoinstall="1"
 				fi
 			elif [ "${distroid}" == "centos" ]; then
-				if [ "${distroversion}" == "7" ]; then
+				if [ "${distroversion}" == "8" ]; then
+					cmd="rpm --import 'https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF';su -c 'curl https://download.mono-project.com/repo/centos8-stable.repo | tee /etc/yum.repos.d/mono-centos8-stable.repo'"
+					eval ${cmd}
+				elif [ "${distroversion}" == "7" ]; then
 					cmd="rpm --import 'https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF';su -c 'curl https://download.mono-project.com/repo/centos7-stable.repo | tee /etc/yum.repos.d/mono-centos7-stable.repo'"
 					eval ${cmd}
 				elif [ "${distroversion}" == "6" ]; then