(MAINT) Use docker-compose config instead file parsing #672
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Parsing the files directly causes issues for variable interpolation in the docker-compose.yml files. For example, the common image name
image:${IMAGE_TAG:-latest}
in a docker-compose.yml will never be found without docker-compose finding $IMAGE_TAG and substituting it.docker-compose config
will also merge the compose files properly without the provider needing to parse and merge manually.My ruby is barely passable, so there may be significant improvements here.