Add /dev/net/tun

Failed to build and run instance: libvirt.libvirtError:
Unable to open /dev/net/tun, is tun module loaded?:
No such file or directory

Signed-off-by: Nobuhiro MIKI <nob@bobuhiro11.net>

Author: bobuhiro11

docker-compose.yaml

@@ -13,6 +13,8 @@ services:
       - /run/lock
     volumes:
       - '/sys/fs/cgroup:/sys/fs/cgroup:ro'
+    devices:
+      - '/dev/net/tun:/dev/net/tun'
     sysctls:
       net.ipv6.conf.all.disable_ipv6: 0
       net.ipv6.conf.default.disable_ipv6: 0
@@ -34,6 +36,8 @@ services:
       - /run/lock
     volumes:
       - '/sys/fs/cgroup:/sys/fs/cgroup:ro'
+    devices:
+      - '/dev/net/tun:/dev/net/tun'
     sysctls:
       net.ipv6.conf.all.disable_ipv6: 0
       net.ipv6.conf.default.disable_ipv6: 0
@@ -55,6 +59,8 @@ services:
       - /run/lock
     volumes:
       - '/sys/fs/cgroup:/sys/fs/cgroup:ro'
+    devices:
+      - '/dev/net/tun:/dev/net/tun'
     sysctls:
       net.ipv6.conf.all.disable_ipv6: 0
       net.ipv6.conf.default.disable_ipv6: 0