Docker heroku deploy button

[Lewiscowles1986]

A series of edits to enable heroku deploys from a button.

• supports multiple MySQL providers (tested on Heroku) [REMOVED]
• brings local-dev docker-compose environment
• makes redis URL configurable (compatible with Heroku) [MOVED TO Healthcheck endpoint #46]
• adds healthcheck endpoint to verify can talk to mysql & redis (not schema check or OAUTH provider check) [MOVED TO Healthcheck endpoint #46]
• css frontend fix to stop horizontal scrollbars (footer margin) [MOVED TO Fix FE CSS for footer #45]
• replaced short tags that do not output <? with <?php [MOVED TO Convert non-output short-tags to full tags #49]
• This has been tested with multiple Heroku DB providers as well as locally in a docker + docker-compose local-dev environment

Could do with a clean-up, test suite, change or removal of config.php [DONE]

[Lewiscowles1986]

Local Docker homepage

[Lewiscowles1986]

Heroku deploy homepage

Heroku deploy other pages

[Lewiscowles1986]

I have not yet worked out the MySQL migrations needed to manage from a raw SQL file on Heroku. I have tested locally and you'll notice a Docker compose MySQL container option because of changes to MySQL auth, which are not yet in PHP PDO at the time of writing.

It's likely that heroku provider specific instructions will differ between vendors

[Lewiscowles1986]

healthcheck & CSS changes have been removed and moved into their own PR

[Lewiscowles1986]

For now this is blocked on the inclusion of 12-factor PR's #47 or a config.php commit (of which I'd strongly recommend one that uses ENV).

I've reduced it's size and functionality to provide a pick-and-mix style approach to docker and heroku setup. This is pretty much now only a local docker environment (with docker-compose) and a heroku deploy.

[Lewiscowles1986]

I need to check this again before it's committed.

[aaronpk]

I've made the changes for config loading from environment variables so it should be possible now to finish this PR. I don't fully understand the current state of this PR though.

[Lewiscowles1986]

Chopped into pieces. I'll test soon and get back to you 👍. Last I checked I was waiting on you to explore an alternative ENV loader