feat(deploy): support timeout flag for helm

[moustafab]

I was playing with this and had trouble getting it to work with some large umbrella charts. The default timeout is 5 minutes with helm (300 seconds) and this provides you with the built-in helm way of changing that. This replaces #1443 I needed to open the PR from my org. Sorry!

[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please visit https://cla.developers.google.com/ to sign.

Once you've signed (or fixed any issues), please reply here (e.g. I signed it!) and we'll verify it.

---

What to do if you already signed the CLA

Individual signers

• It's possible we don't have your GitHub username or you're using a different email address on your commit. Check your existing CLA data and verify that your email is set on your git commits.

Corporate signers

• Your company has a Point of Contact who decides which employees are authorized to participate. Ask your POC to be added to the group of authorized contributors. If you don't know who your Point of Contact is, direct the Google project maintainer to go/cla#troubleshoot (Public version).
• The email used to register you as an authorized contributor must be the email used for the Git commit. Check your existing CLA data and verify that your email is set on your git commits.
• The email used to register you as an authorized contributor must also be attached to your GitHub account.

[moustafab]

signed it

[tjerkw]

The linter failed, please fix:

int64 yaml:"timeout,omitempty" pkg/skaffold/schema/latest/config.go:189:18: struct of size 168 bytes could be of size 160 bytes (maligned) type HelmRelease struct { ^ FAILED hack/linter.sh

[tjerkw]

I fixed it in a new PR #1506

[tjerkw]

I would recommend closing this issue

[moustafab]

Closing in favor of #1507

[tjerkw]

FYI: #1507 was closed in favor to the more general solution of passing flags:
#1673