Sets env var for custom secret
Sets env var for custom secret

An environment variable needs to be set for the custom secret name to be
read. This resolves a bug where the licenseKey.secretName, while
properly mounted, would not be used as the license key secret which
default to ambassador-edge-stack

Signed-off-by: Noah Krause <8c0b8c0be5b8c68ce7dec81b6dc58293d67c9025@gmail.com>

datawire/ambassador,datawire/ambassador,datawire/ambassador,datawire/ambassador,datawire/ambassador