chore: updates Dockerfile to comply with GitHub actions guidelines

[jpower432]

Description

Update Dockerfile to comply with GitHub Actions guidelines

Type of change

Tested locally with podman

podman build -f Dockerfile -t localhost:5000/trestlebot:latest
podman run -e "BRANCH=test" -v <path_to_git_repo>:/data -w /data localhost:5000/trestlebot:latest

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules