Improve workflow event triggers (#23613)

Follow #23037 
Fix [#22598
comment](https://github.com/go-gitea/gitea/issues/22958#issuecomment-1475763042)

Workflows with `pull_request` trigger event can't be triggered by
`pull_request_sync` event. This PR adds the `canGithubEventMatch`
function to check if a Github event can match any Gitea event. If the
Github event matches a Gitea event, the related workflows should be
triggered.

---------

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

modules/actions/github_test.go

@@ -0,0 +1,113 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package actions
+
+import (
+	"testing"
+
+	webhook_module "code.gitea.io/gitea/modules/webhook"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCanGithubEventMatch(t *testing.T) {
+	testCases := []struct {
+		desc           string
+		eventName      string
+		triggeredEvent webhook_module.HookEventType
+		expected       bool
+	}{
+		// registry_package event
+		{
+			"registry_package matches",
+			githubEventRegistryPackage,
+			webhook_module.HookEventPackage,
+			true,
+		},
+		{
+			"registry_package cannot match",
+			githubEventRegistryPackage,
+			webhook_module.HookEventPush,
+			false,
+		},
+		// issues event
+		{
+			"issue matches",
+			githubEventIssues,
+			webhook_module.HookEventIssueLabel,
+			true,
+		},
+		{
+			"issue cannot match",
+			githubEventIssues,
+			webhook_module.HookEventIssueComment,
+			false,
+		},
+		// issue_comment event
+		{
+			"issue_comment matches",
+			githubEventIssueComment,
+			webhook_module.HookEventIssueComment,
+			true,
+		},
+		{
+			"issue_comment cannot match",
+			githubEventIssueComment,
+			webhook_module.HookEventIssues,
+			false,
+		},
+		// pull_request event
+		{
+			"pull_request matches",
+			githubEventPullRequest,
+			webhook_module.HookEventPullRequestSync,
+			true,
+		},
+		{
+			"pull_request cannot match",
+			githubEventPullRequest,
+			webhook_module.HookEventPullRequestComment,
+			false,
+		},
+		// pull_request_target event
+		{
+			"pull_request_target matches",
+			githubEventPullRequest,
+			webhook_module.HookEventPullRequest,
+			true,
+		},
+		{
+			"pull_request_target cannot match",
+			githubEventPullRequest,
+			webhook_module.HookEventPullRequestComment,
+			false,
+		},
+		// pull_request_review event
+		{
+			"pull_request_review matches",
+			githubEventPullRequestReview,
+			webhook_module.HookEventPullRequestReviewComment,
+			true,
+		},
+		{
+			"pull_request_review cannot match",
+			githubEventPullRequestReview,
+			webhook_module.HookEventPullRequestComment,
+			false,
+		},
+		// other events
+		{
+			"create event",
+			githubEventCreate,
+			webhook_module.HookEventCreate,
+			true,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.desc, func(t *testing.T) {
+			assert.Equalf(t, tc.expected, canGithubEventMatch(tc.eventName, tc.triggeredEvent), "canGithubEventMatch(%v, %v)", tc.eventName, tc.triggeredEvent)
+		})
+	}
+}