Create a container to run a DJ worker in dev

[sauloperez]

What? Why?

Time has come to run background jobs in development with docker. I need it to work on #5294 but I think it's better to separate things and ship things independently.

This, however, doesn't let us run letter opener so you'll see errors like

worker_1  | [Worker(host:733aee3327ba pid:1)] 1 jobs processed at 2.9919 j/s, 0 failed
worker_1  | Couldn't find a suitable web browser!
worker_1  | Set the BROWSER environment variable to your desired browser.
worker_1  | Warning: program returned non-zero exit code #1
worker_1  | /usr/bin/xdg-open: 851: /usr/bin/xdg-open: www-browser: not found
worker_1  | /usr/bin/xdg-open: 851: /usr/bin/xdg-open: links2: not found
worker_1  | /usr/bin/xdg-open: 851: /usr/bin/xdg-open: elinks: not found
worker_1  | /usr/bin/xdg-open: 851: /usr/bin/xdg-open: links: not found
worker_1  | /usr/bin/xdg-open: 851: /usr/bin/xdg-open: lynx: not found
worker_1  | /usr/bin/xdg-open: 851: /usr/bin/xdg-open: w3m: not found
worker_1  | xdg-open: no method available for opening 'file:////usr/src/app/tmp/letter_opener/1588260352_4013345_60678af/rich.html'

IMO, this is not a big deal as most of the time I just want the job to happen and not so much about the actual mail or other UI. Now, I need subscriptions to be processed and nothing more. We can solve it after this PR.

What should we test?

run docker-compose up and then:

$ docker-compose exec web bundle exec rails c
irb(main):002:0> Delayed::Job.enqueue SubscriptionPlacementJob.new

You should see log lines like

worker_1  | [Worker(host:733aee3327ba pid:1)] Job SubscriptionPlacementJob (id=13) RUNNING 

from the shell where you boot docker-compose.

Release notes

Run delayed jobs in development with docker

Changelog Category: Added

[luisramos0]

nice one!

[luisramos0]

for once I thought you were going to say "Time has come to run docker in production." 🤣

[sauloperez]

LOL no 😂

[sauloperez]

Sorry guys, I'm merging because I need it to keep working on #5334 and not waste efforts dealing with conflicts. I can confirm it does work.