Add support for ARM arch for rasa-sdk Docker images

[ancalita]

Proposed changes:

• Fixes ATO-2602

Status (please check what you already did):

• made PR ready for code review
• added some tests for the functionality
• updated the documentation in the rasaHQ/rasa
• updated the changelog (please check changelog for instructions)
• reformat files using black (please check Readme for instructions)

[radovanZRasa]

@ancalita could you temporary modify rasa-sdk-dev-docker-image.yml so that it executes on this PR so that we can verify that image is pushed to AWS and we can examine it and confirm that it is multi-platform?

[ancalita]

@ancalita could you temporary modify rasa-sdk-dev-docker-image.yml so that it executes on this PR so that we can verify that image is pushed to AWS and we can examine it and confirm that it is multi-platform?

Sure, great idea, I was also wondering what would be the best way to test this @radovanZRasa

[ancalita]

@radovanZRasa @sanchariGr the dev image for this PR was pushed to AWS, my work laptop is an Intel and I also don't know how to access the AWS registry, could any of you test this please?

[radovanZRasa]

I can confirm that the fix works.
Verified by running:

docker pull 329710836760.dkr.ecr.us-east-1.amazonaws.com/rasa-sdk-dev:latest
docker inspect 329710836760.dkr.ecr.us-east-1.amazonaws.com/rasa-sdk-dev:latest

Resulting response:

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