Adding resource_authentication_bindings

[camjjack]

Enable setting custom authentication flows to a realm created in the same run.

Closes #298

Credit to bruno-delfino1995 code referenced #298 (comment)

[mrparkers]

Hey @camjjack, thanks for this PR. I ended up pushing a fix that's related to some changes I made earlier this week, so this should be in a mergable state now.

I was testing this locally and it looks like this resource is unfortunately fighting with some of the attributes within the keycloak_realm resource. For example, if you don't specify the browser_flow for the keycloak_realm resource and you use this resource to specify it instead, these two resources will fight with each other on each run of terraform apply.

I can continue to mess with this when I have some free time to find a solution. I think we'll have to update the Realm struct to turn those attributes into string pointers, so they aren't sent to Keycloak unless they're specified by the user.

[msvechla]

Any update on this? It looks like the fix with the string pointers has been applied. I would also be open to jump in if something still needs some work

[mrparkers]

Unfortunately, it isn't quite done yet. I had a bit of time last month to push a few commits but I've been swamped lately and haven't had time since to revisit this.

When I left it, there was still some issues with the expected behavior for removing authentication flow assignment via this resource or the keycloak_realm resource. I might be able to put another few hours into this over the weekend so I could hopefully close this out and cut a release.

[mrparkers]

@camjjack @msvechla I've gone ahead and made the required changes to get this in a mergable state. Thanks again @camjjack for all of your hard work on this!