Removing config since it is being added into terraform (#4268)

docker/build/go-agent-marketing/Dockerfile

@@ -27,8 +27,3 @@ RUN php -r "readfile('http://files.drush.org/drush.phar');" > drush && \
 ADD docker/build/go-agent-marketing/files/acquia_github_key.pem /var/go/.ssh/acquia_github_key
 RUN chmod 600 /var/go/.ssh/acquia_github_key && \
     chown go:go /var/go/.ssh/acquia_github_key
-
-# !!!!NOTICE!!!! ---- Runner of this pipeline take heed!! You must replace agent.auto.register.key with the REAL key
-# The key material here is faked and is only used to pass CI!
-# setup the agent autoregister key
-ADD docker/build/go-agent-marketing/config/autoregister.properties /var/lib/go-agent/config/autoregister.properties

docker/build/go-agent-marketing/README.rst

@@ -50,14 +50,6 @@ Building and Uploading the container to ECS
    -  WARNING: Do *NOT* commit/push the real private key to the public
       configuration repo!
 
--  Copy the Agent Auto Register Key to this path:
-
-   -  ``docker/build/go-agent-marketing/config/autoregister.properties``
-   -  A dummy key is in the repo file.
-   -  NOTE: this key *must* match the agentAutoRegisterKey in the server configuration
-   -  WARNING: Do *NOT* commit/push the real private key to the public
-      configuration repo!
-
 -  Create image
 
    -  This must be run from the root of the configuration repository

docker/build/go-agent-marketing/config/autoregister.properties

-agent.auto.register.key=dev-only-override-this-key
-agent.auto.register.resources=edxMarketing
-agent.auto.register.hostname=edxMarketingAgent