hswaw/kube: encrypt keys, update expired keys

cz2's key has expired. Removing it for now as there's no easy way to
force gpg to encrypt content for expired keys.

Change-Id: Ib27b9a09385fcead1ba2d48ebf45426038d8b647
diff --git a/hswaw/kube/secrets/cipher/prod-pretalx-smtp-password b/hswaw/kube/secrets/cipher/prod-pretalx-smtp-password
new file mode 100644
index 0000000..c5cb1d4
--- /dev/null
+++ b/hswaw/kube/secrets/cipher/prod-pretalx-smtp-password
@@ -0,0 +1,29 @@
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+=8rf3
+-----END PGP MESSAGE-----