Merge pull request #686 from rxbynerd/include-intermediate-tls-config-in-docs

Include configuration explanation for intermediate TLS certificates

docs/deploying.md

@@ -89,6 +89,14 @@ docker run -d -p 5000:5000 \
 	registry:2
 ```
 
+A certificate issuer may supply you with an *intermediate* certificate. In this case, you must combine your certificate with the intermediate's to form a *certificate bundle*. You can do this using the `cat` command: 
+
+```
+$ cat server.crt intermediate-certificates.pem > server.with-intermediate.crt
+```
+
+You then configure the registry to use your certificate bundle by providing the `REGISTRY_HTTP_TLS_CERTIFICATE` environment variable.
+
 **Pros:**
 
  - best solution