Add .gitlab-ci.yml

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Name Stage Failure
failed
test:cargo Test
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HEAD is now at 9938ff7 Add .gitlab-ci.yml
Checking out 9938ff7f as master...
Skipping Git submodules setup
$ rustc --version && cargo --version
bash: rustc: command not found
$ cargo test --lib --verbose
bash: cargo: command not found
ERROR: Job failed: exit status 1