feat: publish preview to IPFS on PR

[olizilla]

• move CI from jenkins to circle
• use ipfs-dns-deploy to get an IPFS preview status link on PRs

License: MIT
Signed-off-by: Oli Evans [email protected]

[olizilla]

@PedroMiguelSS i'm seeing test failures when trying to push...

  Running: service-worker.js...  

  1) Service worker activates and then deactivates successfully:
     Uncaught SyntaxError: Unexpected token ...

[PedroMiguelSS]

@alanshaw also mentioned it in #254. I did take a look at this and I found out that cypress has a problem when we use cypress run command. This command by default runs the tests headlessly in the Electron browser. Electron browser does not support es6 syntax.
We are currently using babel to transpile our src/ code but I think we must create a lighter babel config to transpile our node_modules/ code so that Electron does not complain about syntax errors like this one.
Alternatively, we can add --browser chrome to cy:run script. This will open chrome and run the tests automatically. However, this is can only be a temporary solution because when we pass the --browser argument it will attempt to launch the browser if detected on the machine. This is not ideal to run the tests automatically on the CI.

If you want to be sure that the tests are not failing you can run npm run test:e2e and it will open up Chrome and then you can run the tests manually.

I'll fix this, but I need to include this task on my sprint. I'm currently working on IDM project. We can discuss how important comparing to IDM tasks and include it on my sprint.