add test case for semver formats

src/main.ts

@@ -30,6 +30,7 @@ export async function run(): Promise<void> {
     // https://docs.github.com/en/actions/creating-actions/releasing-and-maintaining-actions
     const targetVersion = semver.parse(releaseTag.replace(/^v/, ''))
     if (!targetVersion) {
+      // TODO: We may want to limit semvers to only x.x.x, without the pre-release tags, but for now we'll allow them.
       core.setFailed(
         `${releaseTag} is not a valid semantic version, and so cannot be uploaded as an Immutable Action.`
       )