matrix: add Telegram bridge appservice.

Configuring this one is a bit different from appservice-irc. Notably,
there's no way to give it a registration.yaml to overlay on top of a
config, se we end up using an init container with yq to do that for us.

Also, I had to manually copy the regsitration.yaml in synapse, from
/appservices/telegram-prod/registration.yaml to
/data/appservices/telegram-prod.jsonnet, in order to make it work with
the synapse docker start magic. :/

Otherwise, this is deployed and seems to be working.

Change-Id: Id747a0e310221855556c1d280439376f0c4e5ed6
diff --git a/app/matrix/secrets/cipher/appservice-telegram-prod-api-hash b/app/matrix/secrets/cipher/appservice-telegram-prod-api-hash
new file mode 100644
index 0000000..6328ef9
--- /dev/null
+++ b/app/matrix/secrets/cipher/appservice-telegram-prod-api-hash
@@ -0,0 +1,40 @@
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diff --git a/app/matrix/secrets/cipher/appservice-telegram-prod-api-id b/app/matrix/secrets/cipher/appservice-telegram-prod-api-id
new file mode 100644
index 0000000..45273fd
--- /dev/null
+++ b/app/matrix/secrets/cipher/appservice-telegram-prod-api-id
@@ -0,0 +1,40 @@
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diff --git a/app/matrix/secrets/cipher/appservice-telegram-prod-token b/app/matrix/secrets/cipher/appservice-telegram-prod-token
new file mode 100644
index 0000000..52708e3
--- /dev/null
+++ b/app/matrix/secrets/cipher/appservice-telegram-prod-token
@@ -0,0 +1,41 @@
+-----BEGIN PGP MESSAGE-----
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diff --git a/app/matrix/secrets/plain/.gitignore b/app/matrix/secrets/plain/.gitignore
new file mode 100644
index 0000000..72e8ffc
--- /dev/null
+++ b/app/matrix/secrets/plain/.gitignore
@@ -0,0 +1 @@
+*