Sentry recipe fails when there's no .git directory

[atymic]

Deployer version: 6.4.5
PHP version: 7.3

When using the sentry recipe, if there's no .git folder the deployment fails. This is because my deployment is run from gitlab CI, inside a docker container.

When using the following:

set('sentry', [
    'organization' => 'org',
    'project' => 'project',
    'token' => 'token...',
    'version' => getenv('CI_COMMIT_SHA'),
]);

I get the error:

The command "cd /path/releases/8 && (git rev-parse HEAD)" failed.  

I tried overriding the commits option to a blank array, but this fails the validation.

set('sentry', [
    'organization' => 'org',
    'project' => 'project',
    'token' => 'token...',
    'version' => getenv('CI_COMMIT_SHA'),
    'commits' => [],
]);

I'd be happy to create a PR to add a check, and skip adding commits if .git isn't present.

[antonmedv]

PR will be cool.

[atymic]

PR open in #228 😄