#3129 Fix dead link for CircleCI configuration (#3156)

Co-authored-by: wpanas <[email protected]>

Author: wpanas

docs/supported_docker_environment/index.md

@@ -6,7 +6,7 @@
 |-------------------------------------|-----------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | Linux - general                     | Docker v1.10              |                                                                                                                                                                                                                                                                                                                                                                    |
 | Linux - Travis CI                   | Docker v1.10              | See [example .travis.yml](https://raw.githubusercontent.com/testcontainers/testcontainers-java/master/.travis.yml) for baseline Travis CI configuration                                                                                                                                                                                                                                                                                     |
-| Linux - Circle CI (LXC driver)      | Docker v1.9.1               | The `exec` feature is not compatible with Circle CI. See [example circle.yml](https://raw.githubusercontent.com/testcontainers/testcontainers-java/master/circle.yml) for baseline CircleCI configuration                                                                                                                                                                                                                                   |
+| Linux - CircleCI (LXC driver)      | Docker v1.9.1               | The `exec` feature is not compatible with CircleCI. See CircleCI configuration [example](./continuous_integration/circle_ci.md)                                                                                                                                                                                                                                   |
 | Linux - within a Docker container            | Docker v1.12              | See [Running inside Docker](continuous_integration/dind_patterns.md) for Docker-in-Docker and Docker wormhole patterns                                                                                                                                                                                                                              |
 | Mac OS X - Docker Toolbox           | Docker Machine v0.8.0  |                                                                                                                                                                                                                                                                                                                                                                    |
 | Mac OS X - Docker for Mac      | 1.12.0          | *Support is best-efforts at present*. `getTestHostIpAddress()` is [not currently supported](https://github.com/testcontainers/testcontainers-java/issues/166) due to limitations in Docker for Mac. |