feat(dockerfile): add Dockerfile with relating github action

[clearloop]

Desc

This PR provides the Dockerfile for PINT following the Dockfile of paritytech/polkadot.

For the auto-test of the integration of the parachain and relaychain in CI, as there is a tool polkadot-launch and paritytech/polkadot-launch#83 is WIP, I think we can open a new issue to discuss.

Tests

• Branch cl/docker-staging which use the same code of this PR
• Run docker run -it chainsafe/pint --version to check if the image works

Refs

• Cache Rust dependencies with Docker build
• The Dockerfile of polkadot is using cargo-chef
• The Dockerfile of moonbean, provided by Willem
• The docker-compose.yml of statemint, provided by Matthias

---

Closes #6

[CLAassistant]

All committers have signed the CLA.

[clearloop]

rustc version problem

version	error
nightly	Could not compile polkadot-service
nightly-2020-11-24	Could not compile kusama-runtime

---

According to https://github.com/PureStake/moonbeam/blob/master/docker/polkadot-relay.Dockerfile, trying paritytech/ci-linux:production now

• Build failed with Apple M1 chip
• Dockerfile instructions and overrides in github action
• Substrate Cumulus Parachain Template

[clearloop]

There is a cache problem in CI, maybe could be fixed by #45

[clearloop]

Needs review and advice @mattsse @willemolding

[mattsse]

I'll take this on, however I need a clean install of my docker setup first, something is definitely broken on my end.

[mattsse]

Awesome!
pulling and running the image from dockerhub works great!
In order to test building locally I think it would require a rebase from main first, because I got this error error: no matching package named cumulus-pallet-xcm-handler
Nevermind, this was due to a modified lock file.