initial pass at adding tls support to mysql

[MattMencel]

Description of your changes

Enables tls for MySQL connections. Sets preferred as the default which will fall back to non-tls if unsupported by the MySQL instance.

"Fixes #70":
"Fixes #81":

I have:

• Read and followed Crossplane's [contribution process].
• Run make reviewable test to ensure this PR is ready for review.

How has this code been tested

make reviewable

[Duologic]

The tests seem to fail, can you have a look? Note that the golangci-lint version might differ:

provider-sql/.github/workflows/ci.yml

Lines 13 to 15 in 2f501aa

	GO_VERSION: '1.17'
	GOLANGCI_VERSION: 'v1.31'
	DOCKER_BUILDX_VERSION: 'v0.7.1'

[MattMencel]

The tests seem to fail, can you have a look? Note that the golangci-lint version might differ:

provider-sql/.github/workflows/ci.yml

Lines 13 to 15 in 2f501aa

	GO_VERSION: '1.17'
	GOLANGCI_VERSION: 'v1.31'
	DOCKER_BUILDX_VERSION: 'v0.7.1'

I'm trying to get these tests to run in my fork's Github Actions so I can debug further. Same as Alex in #84 mentions, I'm not sure what to do to test locally. Maybe a quick guide on how to run them locally?

[Duologic]

make reviewable fails when I check out your branch, following make targets should change files that fix the CI:

make fmt.simplify
make generate

[MattMencel]

Both those commands result in this...

> make fmt.simplify
make: *** No rule to make target `fmt.simplify'.  Stop.

I figured it out I think. Added some docs to the README to help future contributors who might not know what they are doing, like me. 😁

[MattMencel]

I bumped golangci-lint to 1.45 in the Github Action. It doesn't seem like there's a simple way to downgrade it on a Mac with Homebrew. All the tests are passing in my fork now.

Also, the CI pipeline has golang 1.17 pinned, but the go.mod file is still at 1.13?

[Duologic]

I had a look at bumping the golangci-lint before but it is also set in the build tools. I think it is best to keep those aligned. https://github.com/upbound/build/blob/master/makelib/golang.mk#L99

If we want to bump versions, I'd suggest doing that in a separate PR so we can also adress the versions in the upstream repo.

[MattMencel]

@Duologic I reverted the golangci-lint change

[Duologic]

I'm attempting to fix the lint CI job in #88

[Duologic]

#88 is merged, do you mind rebasing?

[MattMencel]

@Duologic all the tests passed in my fork

[Duologic]

I think we need to revert the change on the build submodule and follow master.

[MattMencel]

I think we need to revert the change on the build submodule and follow master.

Yeah I tried to debug it yesterday but I wasn't getting anywhere. So change *string back to string you're saying?

[Duologic]

@MattMencel I managed to get it working in #91, you can cherry-pick my commits if you like.

[MattMencel]

@MattMencel I managed to get it working in #91, you can cherry-pick my commits if you like.

@Duologic cherry-picked