Add Docker support

[hammady]

This adds Docker support to simplify running the example shiny app.
No prerequisites are required except having Docker installed.
The README.md is also updated with build/run instructions.

It also adds a new GitHub action to build and push the docker image to GitHub container registry.
This even simplifies running the shiny app further where users can simply pull the image instead of checking out the code and building it locally.

[chriscpritchard]

Hi,

Would you be able to add the ability to add a versioned docker container when a new github release is created?

I think that would be quite useful before merging?

Chris

[hammady]

Would you be able to add the ability to add a versioned docker container when a new github release is created?

I think that would be quite useful before merging?

@chriscpritchard the action defined in this PR builds a docker image on every push to the master branch and tags it with the latest tag (docker tags). Moreover, any git tag that is pushed to that branch which starts with v, e.g. v1.2.3 also tags the generated image with the version number, e.g. 1.2.3. Please check this repo for examples. So basically:

git branch/tag	docker tag
master	latest
v1.2.3	1.2.3
Anything else	No docker tag

[chriscpritchard]

Ah brill, I think I missed that! If you could rebase against master (once I've looked at and merged the URL queries one), I can look to merge!

[hammady]

I rebased on master, will do again once #41 is merged.

[chriscpritchard]

Hi,

Sorry for the delay. I've merged #41 (there was a delay in shinyapps updating to the latest release of R so I couldn't test it).

If you're happy to rebase I can test this branch out and then look to merge and create an updated release.

Thank you for your contribution!

Chris

[hammady]

@chriscpritchard No worries at all. I am planning to work on this PR again this week, I will let you know once rebased.

[hammady]

@chriscpritchard now rebased on master.

[chriscpritchard]

!deploy

[chriscpritchard]

Really sorry about the delay with all this - work is extremely busy! I'll need to update our deployment workflow to use the latest version of the action and then I can test and push this. Hopefully I'll have some capacity over the weekend for this!

[chriscpritchard]

Updated workflows so hopefully !deploy will work!

[chriscpritchard]

Approved