feat(runners): add option to prefix registered runners in GitHub

[npalm]

Fixes #3034

Description

This PR add the option to prefix the name registered in GitHub. By default no prefix will be used.

• The prefix max length is check to ensure the max of 64 chars is not met.
• For scale down the startWith check is replaced by endWith check to match the instance-id
• Choose prefix over postfix since it will make more sense with sorting

Now tags

• EC2 Tag: ghr:runner_name_prefix added
• EC2 Tag: ghr:created_by added values either scale-up-lambda or pool-lambda

Start scripts

For custom AMI's scripts can be updated to retrieve the AWS EC2 Tag RunnerNamePrefix

runner_name_prefix=$(curl -f -H "X-aws-ec2-metadata-token: $token" -v http://169.254.169.254/latest/meta-data/tags/instance/ghr:runner_name_prefix) || true

Next the $runner_name_prefix can be combined with the instanceId the name. When you would like to add a seperator, add this to the terraform variable runner_name_prefix.

Example of runners based on multi-runner example:

Verificaton

Deployed versions main, trigger builds. Next update to branch (rebuild lambda, and ensure runners are active). Next upgrade environment. Checked that old build runners are removed by scale-down, checked new build runners are removed by scale down.

Verififed for:

• mult-runner example
• default example