Proposed changes

Add the SETENV option to the default tedge suoders rule to allow users to control settings via env variable when using sudo.

Before

$ sudo -u tedge sudo TEDGE_C8Y_URL=example.com tedge config get c8y.url
sudo: sorry, you are not allowed to set the following environment variables: TEDGE_C8Y_URL

After

$ sudo -u tedge sudo TEDGE_C8Y_URL=example.com tedge config get c8y.url
example.com

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (general improvements like code refactoring that doesn't explicitly fix a bug or add any new functionality)
• Documentation Update (if none of the other choices apply)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Paste Link to the issue

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA (in all commits with git commit -s. You can activate automatic signing by running just prepare-dev once)
• I ran just format as mentioned in CODING_GUIDELINES
• I used just check as mentioned in CODING_GUIDELINES
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments