mumble: init clan-module

This adds the `mumble` clan-module.

This allows for voice chatting in a true peer-to-peer network.
Every machine that has the module enabled is a potential host and
client - every participant has the same role.

It doesn't matter who in the network is online - as long as one of the
machines is up, one server is up and people can start their voice chat.

checks/mumble/peer_1/key.age

@@ -0,0 +1 @@
+AGE-SECRET-KEY-1UCXEUJH6JXF8LFKWFHDM4N9AQE2CCGQZGXLUNV4TKR5KY0KC8FDQ2TY4NX

checks/mumble/peer_1/peer_1_test_cert

@@ -0,0 +1,22 @@
+-----BEGIN CERTIFICATE-----
+MIIDazCCAlOgAwIBAgIUCUjfNkF0CDhTKbO3nNczcsCW4qEwDQYJKoZIhvcNAQEL
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+-----END CERTIFICATE-----
+

checks/mumble/peer_1/peer_1_test_key

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDCcdZEJvXJIeOK
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+-----END PRIVATE KEY-----