[GitHub] [airflow] mingjie-li opened a new pull request #5494: [AIRFLOW-4856] change hard coded run_as_user to an option in config file

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mingjie-li opened a new pull request #5494: [AIRFLOW-4856] change hard coded run_as_user to an option in config file
URL: https://github.com/apache/airflow/pull/5494
 
 
   Make sure you have checked _all_ steps below.
   
   ### Jira
   
   - [x] My PR addresses the following [AIRFLOW-4856](https://issues.apache.org/jira/browse/AIRFLOW-4856) issues and references them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR"
     - https://issues.apache.org/jira/browse/AIRFLOW-4856
   
   
   ### Description
   
   - [x] Here are some details about my PR, including screenshots of any UI changes:
   when using KubernetesExecutor with git_sync, an init container will be created to sync with the git repo, the init container has a security context with hard coded runAsUser=65533, this pull request aim to change the hard coded value to a config option
   
   ### Tests
   
   - [x] My PR adds the following unit tests:
     * create test_init_environment_using_git_sync_run_as_user_empty: when the option is empty, not security context should be created
     * update test_worker_git_dags to check the value of the option has been correctly added to security context
   
   ### Commits
   
   - [x] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)":
     1. Subject is separated from body by a blank line
     1. Subject is limited to 50 characters (not including Jira issue reference)
     1. Subject does not end with a period
     1. Subject uses the imperative mood ("add", not "adding")
     1. Body wraps at 72 characters
     1. Body explains "what" and "why", not "how"
   
   ### Documentation
   
   - [ ] In case of new functionality, my PR adds documentation that describes how to use it.
     - All the public functions and the classes in the PR contain docstrings that explain what it does
     - If you implement backwards incompatible changes, please leave a note in the [Updating.md](https://github.com/apache/airflow/blob/master/UPDATING.md) so we can assign it to a appropriate release
   
   ### Code Quality
   
   - [ ] Passes `flake8`
   

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