Support Self Certificate Authority (CA) in http transport

[phang98]

In enterprise environment that using transparent SSL Scanner such as McAfee Web Gateway (MWG), the agent require to support self certificate authority (CA) in http transport layer to avoid issue,

WARNING: failed to retrieve S3 URL in connectivity test, agent will fail to upload metrics to Cloudability with error: Unable to retrieve upload URI: Post \"https://metrics-collector.cloudability.com/metricsample\": x509: certificate signed by unknown authority"

[X-dark]

This is addressed by mounting a valid CA bundle in /etc/ssl/certs/. For Helm, you can specify volume and volumeMount in the value file.