Unifying go version across files

[alegrey91]

Currently we are specifying the go version in several files in the codebase:

• go.mod file
• Dockerfile base image for the build
• .github/workflows/* when we install go through the github actions
• Probably somewhere else

To avoid a version misalignments, we should fix the way we set the go version in all the files listed above.
The single source of truth could be the go.mod file, so that the other files can retrieve the go version from there.
Additionally, I'm thinking to remove the building stage from the Dockerfile and use it just to COPY the harpoon artifact inside of it once built outside.
This will simplify the process and make the build unique.

[Mughees2001]

Hello, I would like to work on this problem

[alegrey91]

Hello @Mughees2001, you are welcome!
If you need some clarification about the issue feel free to ask :)
We can also arrange a meeting if you need.