Fix connector build failure in Windows

[ayeshLK]

Purpose

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Fixes: #6664

Following are the findings related to this issue:

• When running the build, the docker command fails silently and due to that FileNotFoundException is thrown when the plugin tries to extract the package bala
• The docker command failure was due to having invalid environment variables in the docker.env file

Following improvements should be done to the plugin to fix this:

• Log the docker command failure as an error in the console
• Exclude the not-required environment variables from the docker.env file