Add reusable workflow for Docker

[veaceslavdoina]

This PR adds reusable workflow for Docker builds (codex-storage/cs-codex-dist-tests/issues/42)

1. Reusable workflow - docker-reusable.yml
2. Main workflow - docker.yml
3. Dist-Tests workflow - docker-dist-tests.yml

Usage example

# Minimal
jobs:
  build-and-push:
    name: Build and Push
    uses: ./.github/workflows/docker-reusable.yaml
    secrets: inherit

# Fully customized
jobs:
  build-and-push:
    name: Build and Push
    uses: ./.github/workflows/docker-reusable.yaml
    with:
      docker_file: docker/codex.Dockerfile
      docker_repo: codexstorage/nim-codex
      make_parallel: 4
      nat_ip_auto: false
      tag_latest: true
      tag_sha: true
      tag_suffix: ''
    secrets: inherit

Workflow accept the following parameters

Parameter	Default
docker_file	docker/codex.Dockerfile
docker_repo	codexstorage/nim-codex
make_parallel	4
nimflags	-d:disableMarchNative
nat_ip_auto	false
tag_latest	true
tag_sha	true
tag_suffix	''

Tags

#	Configuration	Git Commit	Git Tag
1	tag_latest=false tag_sha=true	sha-af3cc6d	0.0.1
2	tag_latest=true tag_sha=false	latest	0.0.1 latest
3	tag_latest=true tag_sha=true	latest, sha-af3cc6d	latest 0.0.1
4	tag_latest=false tag_sha=true tag_suffix=custom	sha-af3cc6d-custom	0.0.1-custom
5	tag_latest=true tag_sha=false tag_suffix=custom	latest-custom	latest-custom 0.0.1-custom
6	tag_latest=true tag_sha=true tag_suffix=custom	latest-custom, sha-af3cc6d-custom	latest-custom, 0.0.1-custom

Test result

# Main
docker run --rm -p 8080:8080 codexstorage/nim-codex:latest codex --api-bindaddr=0.0.0.0

# Dist-Tests
docker run --rm -p 8080:8080 codexstorage/nim-codex:latest-dist-tests codex --api-bindaddr=0.0.0.0

[emizzle]

Looks really good Slava, well done! 🥳