Release pipeline for multiarch binaries and an image (#432)

* add release binaries

* test

* Test builds

* Install protobuff

* Install protobuff for mac and windows

* use sudo

* workaround windows warning

* typo

* typo2

* github vars at their best

* remove RUSTFLAGS

* remove windows instead

* mint release

* undebug

* more docs; build binary for an image

* Containerfile and joint pipeline to build-publish it

* debug workspace

* debug workspace 2

* debug workspace 3

* undebug, add dependabot

* expose more ports

* edit README; remove old CI

* edit github context variables

* fix COPY

* fix COPY chown

* fix GLIBCXX error

* optimize Containerfile

* don't cache the release

* Update README.md

update readme with redirect to upstream substrate docker instructions…

…. remove old docker files (#422)

Co-authored-by: Sacha Lansky <sacha@parity.io>

Auto-Update substrate-node-template from polkadot-v0.9.39 (#415)

Co-authored-by: substrate-developer-hub <devops-team@parity.io>

Auto-Update substrate-node-template from polkadot-v0.9.37 (#413)

Co-authored-by: substrate-developer-hub <devops-team@parity.io>

Remove and ignore .envrc (#412)

Auto-Update substrate-node-template from polkadot-v0.9.35 (#404)

Co-authored-by: substrate-developer-hub <devops-team@parity.io>

Fix build and publish docker GitHub Action typo (#402)

Update to latest enum syntax (#382)

Auto-Update substrate-node-template from polkadot-v0.9.31 (#386)

Co-authored-by: substrate-developer-hub <devops-team@parity.io>

Auto-Update substrate-node-template from polkadot-v0.9.30 (#380)