Fix string encoding in DockerOperator when using xcom / json

[AlessioM]

closes: #13535

fixes the xcom issue by decoding the byte array of the log file before submitting it to xcom

[boring-cyborg]

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[github-actions]

The PR is likely OK to be merged with just subset of tests for default Python and Database versions without running the full matrix of tests, because it does not modify the core of Airflow. If the committers decide that the full tests matrix is needed, they will add the label 'full tests needed'. Then you should rebase to the latest master or amend the last commit of the PR, and push it with --force-with-lease.

[github-actions]

The Workflow run is cancelling this PR. It has some failed jobs matching ^Pylint$,^Static checks,^Build docs$,^Spell check docs$,^Backport packages$,^Provider packages,^Checks: Helm tests$,^Test OpenAPI*.

[github-actions]

The Workflow run is cancelling this PR. It has some failed jobs matching ^Pylint$,^Static checks,^Build docs$,^Spell check docs$,^Backport packages$,^Provider packages,^Checks: Helm tests$,^Test OpenAPI*.

[dimberman]

@AlessioM can you please rebase on master?

[AlessioM]

@AlessioM can you please rebase on master?

sorry for taking so long, done just now

[enima2684]

Many thanks for working on that issue !
Looking forward to use the fix !

[fsalvini]

Hi @AlessioM, thank you very much for this fix.
Will you be able to find the time to complete this PR?

[cjk]

I'm still running into #13487 in Airflow 2.0.1 - hope this gets merged soon. 🙏

[RosterIn]

@AlessioM you will need to rebase to fix the conflicts

[RosterIn]

hi @kaxil @AlessioM @turbaszek is there a way to make progress with this fix?
This ismuch needed I don't mind open a new PR copying the code here so it can be finally merged but it seems like rebase this is very simple.

[AlessioM]

sorry,that it takes so long, hard to find time at the moment
we are running the patch in production at the moment and are currently investigating an issue with German Umlauts in log messages. Not sure yet if its because of this fix or some other issue

[fredthomsen]

I am curious as to the issues/log messages being encountered here. I have had to patch our DockerOperator using this version and it seems to be running without issues.

[potiuk]

@AlessioM I will rebase it for you (as I added some changes in Docker Operator) - I am just about to FINALLY release RC2 of providers so I would love to get that one in.

[potiuk]

I rebased and pushed it @AlessioM :) (I also changed ADDITIONAL_INFO to CHANGELOG :)

[potiuk]

I simplified it a bit more (there was no need to use logs, It's much simpler if we used already available array of potentially decoded lines and added more comprehensive tests

[boring-cyborg]

Awesome work, congrats on your first merged pull request!