fix: add git to argo-events image

[tdenmon]

This commit adds git to the argo-events Docker image, which is required in order to use Git as a source for a Sensor.

Fixes #3065

Checklist:

• My organization is added to USERS.md.

[tdenmon]

Copying the relevant linked libraries is not my ideal solution here, but as git is dynamically linked in the apk package it's either this or cloning down the git source code and manually building it statically linked.

This is the far faster solution. I'm open to suggestions/pushback here though.

[whynowy]

The git binary was even before my time. But I don't think we need it in the image - we use go-git lib, and it worked before. It went to a bad state due to some unknown changes. Need investigation.

[tdenmon]

The git binary was even before my time. But I don't think we need it in the image - we use go-git lib, and it worked before. It went to a bad state due to some unknown changes. Need investigation.

Could be related to go-git #838? There's a refactor PR to explicitly drop any dependency on an external git binary.

[whynowy]

The git binary was even before my time. But I don't think we need it in the image - we use go-git lib, and it worked before. It went to a bad state due to some unknown changes. Need investigation.

Could be related to go-git #838? There's a refactor PR to explicitly drop any dependency on an external git binary.

Probably...