Add support removable media for snap version of gitia.
for get more info about removable media interface see the snapcraft [documentation](https://snapcraft.io/docs/removable-media-interface)
apps:
gitea:
command: gitea
- plugs: [network, network-bind]
+ plugs: [network, network-bind, removable-media]
web:
command: gitea web
daemon: simple
- plugs: [network, network-bind]
+ plugs: [network, network-bind, removable-media]
dump:
command: gitea dump
- plugs: [home]
+ plugs: [home, removable-media]
version:
command: gitea --version
sqlite: