YAML String interpolation for image property

[ghost]

Describe the problem you'd like to solve

Hi, Is it possible to implement string interpolation via config / environment variables for the "image" property? This would be helpful with running different versions of containers in test pipelines.

The below is compatible with docker-compose, so thinking something similar can be implemented?
image: my-repo/my-image:${IMAGE_TAG:-latest}

Describe the solution you'd like

To be able to use environment variables and/or config variables when specifying an image.

something like this:
image: my-repo/my-image:${IMAGE_TAG:-latest}
and/or
image: my-repo/my-image:<{image_tag}

Describe alternatives you've considered

An alternative I have found is to run docker in docker and have that start up the image using 'docker run' as the command property supports string interpolation

docker-my-app: image: docker:20.10.8 environment: IMAGE_VERSION: <{image_version} command: "sh -c \" docker run --rm my-repo/my-image:${IMAGE_VERSION} \""

Additional context

I'm trying to run cypress tests in a Jenkins pipeline against a docker image my company produces, I want to set up the batect task in a way that developers can use this in their local environments too. The ideal endpoint is for devs/pipelines to be able to run a batect task in the following format

./batect test:cypress --config-var test_img=0.5.7
or
TEST_IMG=0.5.7 ./batect test:cypress
or
./batect test:cypress
with a .env file that specifies what image to test.

Thanks!

[charleskorn]

Hi @ryanb6920, thanks for the suggestion. Something I'm hoping to do soon* is support interpolation like this in almost every field in configuration files. Watch this space.

(*for some definition of soon :) )

[charleskorn]

Take a look at #990 and let me know your thoughts.

[ghost]

Looks like a good solution to me :)

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