* test(config): mock config.js and RENOVATE_CONFIG_FILE

Fixes #4603

* fix: wrap mock in try/catch

docs(enabledManagers): added list of possible managers, removed references to docker and node (#4594)

chore(docs): fix link to crates.io

This commit adds (back) support for GitLab's 'merge when pipeline succeeds'
feature. This feature needs to be enabled by bot owners explicitely because
of an possible race condition in current GitLab versions.

Closes #3265

This reverts commit 0228bd05.