Add option for unsecure driver download in the new driver-loader image

[toamto94]

Motivation
Unsecure driver downloads from external sources are currently not possible from the driver-loader image.
By adding an option in the docker-entrypoint.sh script, this could be added easily. In the respective helm chart, the --http-insecure flag would be passed as an argument and forwarded to the command

Feature

Alternatives

Additional context

Since this had been possible until the migration from the script to falcoctl, it should be added sooner or later anyway.