Move to Github Actions about aet HOT 5 OPEN

This is finished developer-wise. The next steps are:

• take care of internal environment issue in relation to #624
• deploy the release and test it

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You can find the code coverage here.

You can see the details of the release process here (note: you won't see that unless you can login to our confluence space)

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@devzbysiu Automatic PR failed to trigger check.

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@pilarskie it's fixed now. The issue was related to the github bot creating a PR. Github actions have a safety net for infinite loop triggered by bots. Because of that, the PR which is created by the bot does not trigger the workflow. The workaround for that is to use an existing user to create a PR.

From the functional perspective, nothing changed. The release is created the same way. After it finishes, the PR should have triggered PR check.

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Tested and accepted.

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