Support and document pushing to AWS ECR

[yuvipanda]

Description

I want to automatically build and push images to a repository that uses docker credential stores rather than username / password to log in. This is not a documented use-case of this repository, so it's unclear whether it is supported or not.

To start off, let's try getting this action to work with Amazon ECR, as this is a very common registry to use as a test case.

Benefit

This would be valuable because many container registries don't user U/P credentialing (like AWS ECR). Documenting this process for one of them would make it easier for others to understand how they could apply it to other registries.

Implementation

We could test this out by following the Amazon ECR action here:

https://github.com/aws-actions/amazon-ecr-login#usage

Tasks

• Make it possible to push to registries without requiring Username/Password (Support pushing to multiple registries #70)
• Test this process pushing to Amazon ECR and see if it works (working example config)
• Document how to get it working with Amazon ECR in the README somewhere around here

Alternative approaches

Install repo2docker manually and push, which I've done in amfriesz/lpdaac_hls_tutorial#2.

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[choldgraf]

@yuvipanda has this been closed by #70 ?

[choldgraf]

I've updated the top comment on this one, as I think that it was worded a little unclearly. It's not focused on documenting how to set up on Amazon ECR as a test-case so that others have a concrete example to follow for other registries as well.

[consideRatio]

Here is an example of providing credentials, configuring docker to use them, and then doing a docker push with them.

https://github.com/pangeo-data/jupyter-earth/blob/8d2f1b03202158c863ff077dc04c07ec695e355f/.github/workflows/build-image.yaml#L49-L79

[GeorgianaElena]

Finally concluded that the action does indeed work with pushing to an Amazon ECR registry 🎉

I have a working example in this repo here. Note that DOCKER_CONFIG needs to be set in order for repo2docker-action to know where to find the credentials stored in previous steps. (ref: docker/login-action#34)

Without this, pushing the image fails with no basic auth credentials.

(thanks @sgibson91 for pointing me to docker/build-push-action, this was where the quest started from)