RAUC: add a demo cert for bundle signing

This was generated by running:

  openssl req -x509 -newkey rsa:4096 -keyout rauc-key.pem -out rauc-cert.pem \
   -days 3650 -nodes -subj "/O=CzechLight/CN=rauc-demo"

Storing it in Git is obviously terribly insecure, which means that this
certificate can only ever be used for throwaway examples and *not* for
anything real (ha ha).

Change-Id: Ib6ac081f665e837f94d41346778a12a9aac588fb
diff --git a/crypto/rauc-key.pem b/crypto/rauc-key.pem
new file mode 100644
index 0000000..8b30cba
--- /dev/null
+++ b/crypto/rauc-key.pem
@@ -0,0 +1,52 @@
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----