Gitlab CI script doesn't pass exit code of previous command properly
Example ```gitlab-ci.yml```:
```
build_1:
script:
- false && true
- echo $?
```
**Current build result:**
```
gitlab-ci-multi-runner 1.3.2 (0323456)
Using Shell executor...
Running on gitlabci-runner03...
Fetching changes...
HEAD is now at 9f64dee Test commit
From https://myserver/gdubicki/gitlab-ci-test
* [new branch] test-false-and-true -> origin/test-false-and-true
Checking out 810aa8c5 as test-false-and-true...
$ false && true
$ echo $?
0
Build succeeded
```
**Expected build result:**
like above but ```echo $?``` should print 1 instead of 0.
issue