Publish polkadot-parachain docker images on PRs (#1311)

* [WIP] Dockerize polkadot-parachain

* fix build job

* disable test job for debug

* disable all tests for debug

* add publish docker

* fix docker publish

* uncomment tests; add dag

* fix docker naming

* add DAG to build job

* small fixes

* combine test and build

* fix typo

* divide test and build back

* Update .gitlab-ci.yml

Co-authored-by: Denis Pisarev <[email protected]>

* rename docker image

* add needs publish-s3

* remove collect artifacts from test

Co-authored-by: Denis Pisarev <[email protected]>