Add concept of "Expiration" to jobs

[bnvk]

Moved from opensourcedesign/jobs#131 by @evalica

While usually we start having the need for this kind of functionality when we are flooded with posts (not quite yet, although we have 56 entries, from which 39 are searching), the problem we have is that:

• we don't know if the job post is still active
• people from our organization might forget to mark a post as "closed"
• people that initially added the post might forget to close it in our repo.

A solution would be to:

• allow people to add in the job template the expiration date;
• have a filter on the website and just display not expired job posts;
• have a listener and automatically change the status to "expired" if the date passed (although I don't think this is possible on the platform used).
• notify poster of job that it has "expired"

The first two tasks can be done with Jekyll, but the later two will require some sort of server daemon / service that checks and monitors things!

---

Added an implementation suggestion from #101

<div class="form-group">
  <label for="deadline">
    Deadline
    <small>(optional)</small>
  </label>
  <p class="help-block">If you need the work done until a specific date.</p>
  <input class="form-control"
    id="deadline"
    placeholder="3 months from job posting date"
    name="fields[deadline]" />
</div>

[simonv3]

We can probably deploy something on Heroku that does that checking periodically through a cron job.

[elioqoshi]

Agree with that. Would be useful to have it.

[Erioldoesdesign]

Bumping this issue/thread with a recent forum post/conversation: https://discourse.opensourcedesign.net/t/results-closure-on-jobs-postings/1714/4

Not having dates on our jobs currently leaves them floating in limbo for designers potentially wanting to pick them up