Add mailhog

ressources/mailhog/rootfs/usr/bin/.gitkeep

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+

ressources/mailhog/rootfs/usr/lib/systemd/system/mailhog.service

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+[Unit]
+Description=service mailhog
+Documentation=https://github.com/mautrix/MailHog
+
+After=network.target
+
+[Service]
+User=mailhog
+Group=mailhog
+EnvironmentFile=/etc/default/mailhog
+ExecStart=/usr/bin/mailhog
+WorkingDirectory=/tmp
+Restart=on-failure
+RestartSec=30s
+#ReadWritePaths=/tmp
+NoNewPrivileges=yes
+MemoryDenyWriteExecute=true
+PrivateDevices=yes
+PrivateTmp=yes
+ProtectHome=yes
+ProtectSystem=strict
+ProtectControlGroups=true
+RestrictSUIDSGID=true
+RestrictRealtime=true
+LockPersonality=true
+ProtectKernelLogs=true
+ProtectKernelTunables=true
+ProtectHostname=true
+ProtectKernelModules=true
+PrivateUsers=true
+ProtectClock=true
+SystemCallArchitectures=native
+SystemCallErrorNumber=EPERM
+SystemCallFilter=@system-service
+
+[Install]
+WantedBy=multi-user.target