bug fix: postfix install cent8

Author: usmannasir

install/install.py

@@ -691,7 +691,9 @@ def install_postfix_davecot(self):
             if self.distro == centos:
                 command = 'yum install --enablerepo=CyberPanel -y postfix3 postfix3-ldap postfix3-mysql postfix3-pcre'
             elif self.distro == cent8:
-                command = 'dnf install postfix3 postfix3-mysql -y '
+                command = 'dnf --nogpg install -y https://mirror.ghettoforge.org/distributions/gf/el/8/gf/x86_64/gf-release-8-11.gf.el8.noarch.rpm'
+
+                command = 'dnf install --enablerepo=gf-plus postfix3 postfix3-mysql -y'
             else:
                 command = 'apt-get -y debconf-utils'
                 preFlightsChecks.call(command, self.distro, command, command, 1, 0, os.EX_OSERR)
@@ -720,7 +722,7 @@ def install_postfix_davecot(self):
             if self.distro == centos:
                 command = 'yum --enablerepo=CyberPanel -y install dovecot dovecot-mysql'
             elif self.distro == cent8:
-                command = 'dnf install dovecot23 dovecot23-mysql -y'
+                command = 'dnf install --enablerepo=gf-plus dovecot23 dovecot23-mysql -y'
             else:
                 command = 'apt-get -y install dovecot-mysql'