potiuk opened a new pull request #5624: [AIRFLOW-5004] [depends on AIRFLOW-4997, AIRFLOW-4999, AIRFLOW-5001] Branch/image for CI builds is selected via TRAVIS_BRANCH URL: https://github.com/apache/airflow/pull/5624 Make sure you have checked _all_ steps below. ### Jira - [x] 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-5004 ### Description - [x] Here are some details about my PR, including screenshots of any UI changes: When building CI images you need to know whether you use v1-10-test or v1-10-stable branch (and use corresponding image). Currently the default branch is read from _default_branch.sh . This is not a problem for master/v1-10-test distinction because those are in different "physical" branches, but v1-10-stable and v1-10-test are actually following one-another (v1-10-test moves first and when several commits pass, then stable branch follows). Therefore we need to utilise TRAVIS_BRANCH variable - this variable works in two modes - for PRs it is the branch that the PR is going to be merged to, whereas for triggered builds it's the branch from which the build was triggered. This is perfect for us to determine which image should be used during build. ### Tests - [x] My PR adds the following unit tests __OR__ does not need testing for this extremely good reason: All tests! ### 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 - [x] 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 - [x] Passes `flake8`
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