[GitHub] [airflow] potiuk opened a new pull request #6538: [AIRFLOW-5886] Selective copying of sources in Docker image depends on [AIRFLOW-5885]

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potiuk opened a new pull request #6538: [AIRFLOW-5886] Selective copying of sources in Docker image depends on [AIRFLOW-5885]
URL: https://github.com/apache/airflow/pull/6538
 
 
   Note for reviewed - this change depends on #6536 so please review only last commit.
   
   This change further improves time of rebuilds for docker image when your
   sources change (very useful in case of building kubernetes image). It adds only
   directories that are needed (it is synchronised with .dockerignore and local
   mounts) and in the sequence that reflects frequency of changes. Also pip
   install is not done again after sources change (there is no point) so the
   build is much faster when only sources or test file change.
   
   Also - since we are modifying Dockerfile, it turned out that "airflow" user is not needed
   in the CI image any more so I removed it to save additional Dockerfile modification.
   
   Make sure you have checked _all_ steps below.
   
   ### Jira
   
   - [ ] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR"
     - https://issues.apache.org/jira/browse/AIRFLOW-XXX
     - In case you are fixing a typo in the documentation you can prepend your commit with \[AIRFLOW-XXX\], code changes always need a Jira issue.
     - In case you are proposing a fundamental code change, you need to create an Airflow Improvement Proposal ([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvements+Proposals)).
     - In case you are adding a dependency, check if the license complies with the [ASF 3rd Party License Policy](https://www.apache.org/legal/resolved.html#category-x).
   
   ### Description
   
   - [ ] Here are some details about my PR, including screenshots of any UI changes:
   
   ### Tests
   
   - [ ] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason:
   
   ### Commits
   
   - [ ] 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
   

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