Maintenance: Introduce workflow to add t-shirt size on PR

[dreamorosi]

Summary

We'd like to automatically label PRs based on the amount of lines of code (LOC) that were changed.

Why is this needed?

This will help maintainers to better estimate the effort needed to review a given PR at a glance.

Which area does this relate to?

Automation

Solution

Automation should do this both on internal & external (i.e. from forks) PRs.

Acknowledgment

• This request meets Lambda Powertools Tenets
• Should this be considered in other Lambda Powertools languages? i.e. Python, Java

[dreamorosi]

Labels to be introduced are:

Label	Usage	Notes
size/XS	PRs between 0-9 LOC	PR automation
size/S	PRs between 10-29 LOC	PR automation
size/M	PRs between 30-99 LOC	PR automation
size/L	PRs between 100-499 LOC	PR automation
size/XL	PRs between 500-999 LOC, often PRs that grown with feedback	PR automation
size/XXL	PRs with 1K+ LOC, largely documentation related	PR automation

[dreamorosi]

I have enabled the pull-request-size bot that is already enabled for our org & is used by Powertools for Python as well:

The action is triggered on new and existing PRs when code changes.

The labels will be documented in a future PR.

[github-actions]

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