feat: add support for running on release event (#1191)

Co-authored-by: GitHub Action <action@github.com>

src/commitSha.ts

@@ -83,7 +83,9 @@ export const getSHAForPushEvent = async (
     core.info('Repository is shallow, fetching more history...')
 
     if (isTag) {
-      const sourceBranch = env.GITHUB_EVENT_BASE_REF.replace('refs/heads/', '')
+      const sourceBranch =
+        env.GITHUB_EVENT_BASE_REF.replace('refs/heads/', '') ||
+        env.GITHUB_EVENT_RELEASE_TARGET_COMMITISH
       await gitFetch({
         cwd: workingDirectory,
         args: [

src/env.ts

@@ -8,6 +8,7 @@ export type Env = {
   GITHUB_REF_NAME: string
   GITHUB_REF: string
   GITHUB_EVENT_BASE_REF: string
+  GITHUB_EVENT_RELEASE_TARGET_COMMITISH: string
   GITHUB_EVENT_HEAD_REPO_FORK: string
   GITHUB_WORKSPACE: string
   GITHUB_EVENT_FORCED: string
@@ -27,6 +28,9 @@ type GithubEvent = {
     }
     number: string
   }
+  release?: {
+    target_commitish: string
+  }
   before?: string
   base_ref?: string
   head_repo?: {
@@ -49,6 +53,8 @@ export const getEnv = async (): Promise<Env> => {
     GITHUB_EVENT_PULL_REQUEST_BASE_REF: eventJson.pull_request?.base?.ref || '',
     GITHUB_EVENT_BEFORE: eventJson.before || '',
     GITHUB_EVENT_BASE_REF: eventJson.base_ref || '',
+    GITHUB_EVENT_RELEASE_TARGET_COMMITISH:
+      eventJson.release?.target_commitish || '',
     GITHUB_EVENT_HEAD_REPO_FORK: eventJson.head_repo?.fork || '',
     GITHUB_EVENT_PULL_REQUEST_NUMBER: eventJson.pull_request?.number || '',
     GITHUB_EVENT_PULL_REQUEST_BASE_SHA: eventJson.pull_request?.base?.sha || '',