Add Gitlab CI file

2 jobs for master in 3 minutes and 23 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
failed #448551026
rust-latest

00:03:20

failed #448551027
allowed to fail
rust-nightly

00:03:23

 
Name Stage Failure
failed
rust-nightly Build
error: failed to run custom build command for `openssl v0.9.24`

Caused by:
process didn't exit successfully: `/builds/stavros/hearth/target/debug/build/openssl-742b6e984dbdc714/build-script-build` (exit code: 101)
--- stderr
thread 'main' panicked at 'Unable to detect OpenSSL version', /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/openssl-0.9.24/build.rs:16:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

ERROR: Job failed: exit code 1
failed
rust-latest Build
error: failed to run custom build command for `openssl v0.9.24`

Caused by:
process didn't exit successfully: `/builds/stavros/hearth/target/debug/build/openssl-d1185be62ca9e667/build-script-build` (exit code: 101)
--- stderr
thread 'main' panicked at 'Unable to detect OpenSSL version', /usr/local/cargo/registry/src/github.com-1ecc6299db9ec823/openssl-0.9.24/build.rs:16:14
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

ERROR: Job failed: exit code 1