Add integration tests

[JU4N98]

Changes proposal:

• Adds integration test for mysql, postgres and client-server golang app.

[faisal-memon]

@JU4N98 Why do you open and close this pr twice?

[JU4N98]

Sorry, my mistake, the commits weren't signed as was required.

[faisal-memon]

Sorry, my mistake, the commits weren't signed as was required.

you can add that to an existing pr, don't need to close.

[JU4N98]

I didn't know that, I'll take that into account. Thanks!