[Feature][Doc] Added change log. (#13158)

docs/docs/en/changelog.md

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+# Change Log
+
+## Bugfix
+
+- [Bug-12954] [Schedule] Fix that workflow-level configuration information does not take effect when timing triggers execution (#12955)
+- [Fix][ui] download resource return 401 (#12566)
+- make sure all failed task will save in errorTaskMap (#12424)
+- Fix timing scheduling trigger master service report to get command parameter null pointer exception (#12419)
+- [fix] Change the default unix shell executor from sh to bash (#12180)
+- fix-ldap-error (#12929)
+
+## Document
+
+- [Feature-8030][docs] Add sqoop task doc (#12855)
+- [doc][fix] Add new alert doc Slack (#12567)
+- [Improvement][document]Update architecture and process-start-flow pic (#12912)
+
+**Full Changelog**: https://github.com/apache/dolphinscheduler/compare/3.0.2...3.0.3