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/machines/peer1/facts/mumble-cert

@@ -0,0 +1,22 @@
+-----BEGIN CERTIFICATE-----
+MIIDazCCAlOgAwIBAgIUCUjfNkF0CDhTKbO3nNczcsCW4qEwDQYJKoZIhvcNAQEL
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+5Yq/B4yrh303j0CXaobCQ4nQH7zI7fhViww+TzW7vDhgM7ueEyyXrqCXt6JY8avg
+TuvIRtJSeWSQJ5aLNaYqmiwMf/tj9W3BMDpctGyLqu1WTSrbpYa9mA5Vudud70Yz
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+ZqMUUkA4DSucb6xxEcTK
+-----END CERTIFICATE-----
+

checks/mumble/machines/peer1/key.age

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

checks/mumble/machines/peer1/peer_1_test_cert

@@ -0,0 +1,14 @@
+-----BEGIN CERTIFICATE-----
+MIICHTCCAaKgAwIBAgIIT2gZuvqVFP0wCgYIKoZIzj0EAwIwSjESMBAGA1UEChMJ
+U3luY3RoaW5nMSAwHgYDVQQLExdBdXRvbWF0aWNhbGx5IEdlbmVyYXRlZDESMBAG
+A1UEAxMJc3luY3RoaW5nMB4XDTIzMTIwNjAwMDAwMFoXDTQzMTIwMTAwMDAwMFow
+SjESMBAGA1UEChMJU3luY3RoaW5nMSAwHgYDVQQLExdBdXRvbWF0aWNhbGx5IEdl
+bmVyYXRlZDESMBAGA1UEAxMJc3luY3RoaW5nMHYwEAYHKoZIzj0CAQYFK4EEACID
+YgAEBAr1CsciwCa0vi7eC6xxuSGijY3txbjtsyFanec/fge4oJBD3rVpaLKFETb3
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+haCwJInHZvZgclHk4EtFpTw=
+-----END CERTIFICATE-----

checks/mumble/machines/peer1/peer_1_test_key

@@ -0,0 +1,6 @@
+-----BEGIN EC PRIVATE KEY-----
+MIGkAgEBBDA14Nqo17Xs/xRLGH2KLuyzjKp4eW9iWFobVNM93RZZbECT++W3XcQc
+cEc5WVtiPmWgBwYFK4EEACKhZANiAAQECvUKxyLAJrS+Lt4LrHG5IaKNje3FuO2z
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+tGG3BKYCzwAcsW7yKtWfyxmOCQuxcyE=
+-----END EC PRIVATE KEY-----