Pin versions in apt get install. Instead of `apt-get install <package>` use `apt-get install <package>=<version>`

[codacy-production]

Codacy detected an issue:

Message: Pin versions in apt get install. Instead of apt-get install useapt-get install =``

Occurred on:

• Commit: 2e89146
• File: Dockerfile
• LineNum: 4
• Code: RUN apt-get update -y && apt-get install -y git python3-pip

Currently on:

• Commit: 00c1a8a
• File: Dockerfile
• LineNum: 4