Salesforce has partnered with GitLab.

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Salesforce DX tools enable test automation and continuous delivery,but getting 
started can be daunting.We have partnered together to provide templates that 
make GitLab’s CI/CD work out of the box,easy to customize, and integrate well with GitLab’s
other leading capabilities,such as project planning, testing, and security.

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But, what are the things salesforce can achieve with GitLab but not with DX with respect to only CI/CD activities (not other capabilities like project planning, testing, and security).