CI/CD pipeline for chain

[2075]

• Run CI/CD pipeline in GitLab for external repositories (GitHub zero-network)
• Create a GitLab's docker cloud runner (rust base image)
• Create pipeline (.gitlab-ci.yml)

Pipeline for all envs:

• commit to the dev/stage/main branch triggers pipeline for dev/stage/prod envs
• stage: test (make test, anything else?)
• stage: build image - build, push the image to ECR (docker hub?) tags: env_name for dev stage, latest for prod, version for prod

Pipeline for dev/stage:

• deploy: flush exisiting chain/graph, pull images, run everything from scratch

Pipeline for prod:

• stage: build runtime - store an artifact so Sudo user can use it to manually upgrade a runtime

Notion Envs: https://www.notion.so/zeroio/1-Release-Planning-7d56cbc1f77e4974879b3bc68c729510

[vovacha]

cargo test was broken for some reason. Not sure if we should run it or if make test is enough.

[vovacha]

Let's not split chain and graph #112, but split this task by env.
So, this should be merged with #112 and split: CI/CD dev, CI/CD stage, CI/CD prod (only graph I assume).