Add ebuild for beszel-hub 0.18.3

Signed-off-by: Manuel Friedli <manuel@fritteli.ch>

www-apps/beszel-hub/files/beszel-hub.env

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+# This is a sample config file. Adjust to your needs.
+# See https://beszel.dev/guide/environment-variables#hub for all available
+# variables.
+
+# The application URL. Used for links in emails and notigications. Must set
+# if serving at a subpath.
+#BESZEL_HUB_APP_URL=https://beszel.example.com

www-apps/beszel-hub/files/beszel-hub.service

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+[Unit]
+Description=Beszel Hub Service
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+ExecStart=/usr/bin/beszel-hub
+EnvironmentFile=/etc/beszel-hub/beszel-hub.env
+Restart=on-failure
+RestartSec=5
+StateDirectory=beszel-hub
+
+User=beszel-hub
+Group=beszel
+
+# Security/sandboxing settings
+KeyringMode=private
+LockPersonality=yes
+NoNewPrivileges=yes
+ProtectClock=yes
+ProtectHome=read-only
+ProtectHostname=yes
+ProtectKernelLogs=yes
+ProtectSystem=strict
+RemoveIPC=yes
+RestrictSUIDSGID=true
+
+[Install]
+WantedBy=multi-user.target