Error: websocket: bad handshake when using quay-builder and custom TLS certificate.

https://access.redhat.com/solutions/3526891

The error `websocket: bad handshake` is often the result of starting the quay-builder container before configuring the Quay Enterprise container to accept websocket traffic.

Ensure that Docker Build Support has been enabled in your configuration:

You can also ensure that this is enabled by looking for the parameter FEATURE_BUILD_SUPPORT: in the config.yaml. It should have a value of true.

$ cat config/config.yaml  | grep -i build_support
FEATURE_BUILD_SUPPORT: true

Then start your quay-builder container following the instructions:

https://coreos.com/quay-enterprise/docs/latest/build-support.html