Add PHP quote service

[julianocosta89]

Towards #57.

Changes

Adding PHP service - QuoteService, which will receive requests from ShippingService, calculate the shipping costs and return the quote to Shipping.

For significant contributions please make sure you have completed the following items:

• Appropriate CHANGELOG.md updated for non-trivial changes
• Design discussion raised in Slack: https://cloud-native.slack.com/archives/C03B4CWV4DA/p1661427369272929

[julianocosta89]

@bobstrecansky could you take a look?
Any clean up suggestions are more than welcome.

[bobstrecansky]

@brettmc / @tidal for review, as I'm OoO this week. At face value this looks good to me, but I'm also reading on a tiny screen 😎

[brettmc]

looks pretty good to me. it's based on one of our demos and there are a couple of things unused that could be removed.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 7 days.

[mic-max]

LGTM, thanks for tackling the beast that is PHP ;p
Update the issue this resolves since we decided PHP to be a quote service instead of an admin portal 👍

[cartersocha]

@brettmc would you mind doing a final review on this?

[julianocosta89]

There is no load to the service yet, but we can test in this way ATM:

docker compose up quoteservice --build
Once everything is up and running:

docker run --rm --network opentelemetry-demo curlimages/curl -d '{"numberOfItems":"4"}' -H "Content-Type: application/json" -X POST http://quoteservice:8090/getquote

You can change the numberOfItems to get different quotes.
Simple, but it does the job for now.

[julianocosta89]

@brettmc everything should be good to go 🤩
Thank you very much for all the help!

[cartersocha]

@julianocosta89 great work on this. Are we ready to merge or are there outstanding items? I see the docs are mostly updated and we can clean up the rest post merge

[julianocosta89]

@cartersocha all good to go!
Whenever this gets merged I can start working on the shippingservice call to this service.