Go to #{link_to'Runners page',ci_project_runners_path(@project),target: :blank} for instructions.
Go to #{link_to'Runners page',runners_path(@project.gl_project),target: :blank} for instructions.
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Put the .gitlab-ci.yml in the root of your repository. Examples can be found in #{link_to"Configuring project (.gitlab-ci.yml)","http://doc.gitlab.com/ci/yaml/README.html",target: :blank}.
You can also test your .gitlab-ci.yml in the #{link_to"Lint",ci_lint_path}
GitLab Runners do not offer secure isolation between projects that they do builds for. You are TRUSTING all GitLab users who can push code to project A, B or C to run shell scripts on the machine hosting runner X.