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Fixes Docker Hub repository tag env var name 

As noted in issue #6684 `CACHE_TAG` environment variable is actually empty in the builds, turns out the documented value is represented by a `DOCKER_TAG` variable instead.
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Artem Hluvchynskyi 2019-02-02 01:40:42 +02:00 committed by GitHub
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docker-hub/builds/advanced.md
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@ -22,8 +22,8 @@ processes and do not affect your service's run environment.
* `COMMIT_MSG`: the message from the commit being tested and built.
* `DOCKER_REPO`: the name of the Docker repository being built.
* `DOCKERFILE_PATH`: the dockerfile currently being built.
* `CACHE_TAG`: the Docker repository tag being built.
* `IMAGE_NAME`: the name and tag of the Docker repository being built. (This variable is a combination of `DOCKER_REPO`:`CACHE_TAG`.)
* `DOCKER_TAG`: the Docker repository tag being built.
* `IMAGE_NAME`: the name and tag of the Docker repository being built. (This variable is a combination of `DOCKER_REPO`:`DOCKER_TAG`.)
If you are using these build environment variables in a
`docker-compose.test.yml` file for automated testing, declare them in your `sut`