Move to multi-stage build

[martindekov]

Moving the building process to multi-stage

Signed-off-by: Martin Dekov mvdekov@gmail.com

Description

Now the building process is with multi-stage with latest watchdog

Motivation and Context

• [x] I have raised an issue to propose this change (required)

Closes #127

How Has This Been Tested?

Build the dockerfile, pushed to dockerhub and tested e2e with the newest watchdog:

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [x] Dockerfile update

  Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I've read the CONTRIBUTION guide
• [x] I have signed-off my commits with git commit -s
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.