minor fix (typo) in Dockerfile

[chamalis]

Describe the pull request:

• [ ] Bug fix
• [ ] Functional change
• [ ] New feature
• [X] Code cleanup
• [ ] Build system change
• [ ] Documentation change
• [ ] Language translation

Pull request long description:

Changes made:

1) typo in Dockerfile

Related issues:

Additional information:

Release note:

Documentation change:

Mentions:

[silverdaz]

Thank you but that's not necessary, Version 2 is on its way to be merged into the master branch.