feat: add support for pull_request_target event

Previously, the action was treating pull_request_target event as a regular push,
which was causing some issues.

src/action.js

@@ -9,6 +9,8 @@ const gitCommits = require('./gitCommits')
 const generateOutputs = require('./generateOutputs')
 
 const pullRequestEvent = 'pull_request'
+const pullRequestTargetEvent = 'pull_request_target'
+const pullRequestEvents = [pullRequestEvent, pullRequestTargetEvent]
 
 const { GITHUB_EVENT_NAME, GITHUB_SHA } = process.env
 
@@ -45,7 +47,8 @@ const getRangeForPushEvent = () => {
 }
 
 const getRangeForEvent = async () => {
-  if (GITHUB_EVENT_NAME !== pullRequestEvent) return getRangeForPushEvent()
+  if (!pullRequestEvents.includes(GITHUB_EVENT_NAME))
+    return getRangeForPushEvent()
 
   const octokit = github.getOctokit(core.getInput('token'))
   const { owner, repo, number } = eventContext.issue

src/action.test.js

@@ -261,20 +261,24 @@ describe('Commit Linter action', () => {
     td.verify(core.setFailed(contains('wrong commit from another branch')))
   })
 
-  describe('when there are multiple commits failing in the pull request', () => {
+  describe.each(['pull_request', 'pull_request_target'])(
+    'when there are multiple commits failing in the %s event',
+    (eventName) => {
       let expectedResultsOutput
       const firstMessage = 'wrong message 1'
       const secondMessage = 'wrong message 2'
 
       beforeEach(async () => {
         cwd = await git.bootstrap('fixtures/conventional')
-      td.when(core.getInput('configFile')).thenReturn('./commitlint.config.js')
+        td.when(core.getInput('configFile')).thenReturn(
+          './commitlint.config.js',
+        )
         await gitEmptyCommit(cwd, 'message from before push')
         await gitEmptyCommit(cwd, firstMessage)
         await gitEmptyCommit(cwd, secondMessage)
         await createPullRequestEventPayload(cwd)
         const [, first, to] = await getCommitHashes(cwd)
-      updatePullRequestEnvVars(cwd, to)
+        updatePullRequestEnvVars(cwd, to, { eventName })
         td.when(
           listCommits({
             owner: 'wagoid',
@@ -329,7 +333,8 @@ describe('Commit Linter action', () => {
 
         td.verify(core.setOutput(resultsOutputId, expectedResultsOutput))
       })
-  })
+    },
+  )
 
   describe('when it fails to fetch commits', () => {
     beforeEach(async () => {

src/testUtils.js

@@ -66,10 +66,12 @@ exports.createPullRequestEventPayload = async (cwd) => {
   await writeFile(eventPath, JSON.stringify(payload), 'utf8')
 }
 
-exports.updatePullRequestEnvVars = (cwd, to) => {
+exports.updatePullRequestEnvVars = (cwd, to, options = {}) => {
+  const { eventName = 'pull_request' } = options
+
   updateEnvVars({
     GITHUB_WORKSPACE: cwd,
-    GITHUB_EVENT_NAME: 'pull_request',
+    GITHUB_EVENT_NAME: eventName,
     GITHUB_SHA: to,
   })
 }