Detect whether a release is being rolled back

[mcmire]

If a commit is pushed which rolls back a release candidate and hence downgrades the version of the package in question, then this action will regard it as a release commit. Now, this doesn't affect core (e.g. https://github.com/MetaMask/core/actions/runs/16173551572/job/45653343692) because we also pass a commit message prefix, and release rollbacks don't follow that pattern, so they get rejected by this action.

However, we may actually want to know about release rollbacks. For instance, it would be useful to automatically remove the GitHub release/tag if a release is rolled back, or verify that the version being rolled back is also removed from the changelog. We can't do this well right now without repeating logic.

Therefore, this commit adds a new output, COMMIT_TYPE, which can either be release, release-rollback, or "normal" (not a release or a release rollback). In fact, this commit promotes this output as the one to use in the README and deprecates IS_RELEASE.

Closes #1.

[cursor]

Bug: Semver Prerelease Parsing Fails

The semver comparison script incorrectly handles prerelease versions that contain dots (e.g., "1.0.0-alpha.1"). It splits the full version string by dots before extracting the prerelease, causing parts of the prerelease identifier (like the '1' in 'alpha.1') to be incorrectly parsed as numeric version components. This leads to erroneous version comparisons.

scripts/compare-semver-versions.sh#L9-L30

action-is-release/scripts/compare-semver-versions.sh

Lines 9 to 30 in e0c2c5f

	# Split versions into major.minor.patch and prerelease
	IFS='.' read -a v1_parts <<< "$version1"
	IFS='.' read -a v2_parts <<< "$version2"
	# Extract prerelease parts if they exist
	local v1_prerelease=""
	local v2_prerelease=""
	# Check if version1 has prerelease (contains hyphen)
	if [[ "$version1" == *"-"* ]]; then
	v1_prerelease="${version1#*-}"
	# Remove prerelease from parts array
	v1_parts=("${v1_parts[@]%-*}")
	fi
	# Check if version2 has prerelease (contains hyphen)
	if [[ "$version2" == *"-"* ]]; then
	v2_prerelease="${version2#*-}"
	# Remove prerelease from parts array
	v2_parts=("${v2_parts[@]%-*}")
	fi

Fix in Cursor • Fix in Web

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