[systemd] Add mailhog service

systemd/.config/systemd/user/mailhog.service

@@ -0,0 +1,17 @@
+[Unit]
+Description=Mailhog
+After=network.target
+
+[Service]
+ExecStart=/usr/bin/env /usr/local/bin/mailhog > /dev/null 2>&1 &
+Restart=on-failure
+SuccessExitStatus=3 4
+RestartForceExitStatus=3 4
+
+# Hardening
+SystemCallArchitectures=native
+MemoryDenyWriteExecute=true
+NoNewPrivileges=true
+
+[Install]
+WantedBy=default.target