Add new workflow to validate version bumps

[arboleya]

Before we hit stable v1, our semver requires a slight shift:

• major — never (for now)
• minor — when we introduce a breaking change
• patch — everything else (non-breaking)

This has been a source of misunderstanding on several PRs, something a simple workflow could automate.

One way to do this is to only allow minor bumps when the PR has breaking changes (look for ! in the title).

[maschad]

This could be perhaps provide a good short-term fix till we release our major.

One way to do this is to only allow minor bumps when the PR has breaking changes (look for ! in the title).

I assume we would also allow minor bumps for feats as well?

[arboleya]

No, minor must be reserved for breaking changes only, mimicking what would be a major bump.

[arboleya]

Sometimes, we may mix patch with minor.

Please, refer to this comment for more info.