Add optional support for passing env variables into provider

[kuzaxak]

Needed to support dynamic auth as described in issue, as we are using sops dependency which is using native aws sdk, it will read such configuration from env variables of the process.

Additionally, I upgraded deprecated terraform SDK such as replacing Read into ReadContext and added

[kuzaxak]

@carlpett hey, could you please have a look?

[carlpett]

Hi @kuzaxak,
Apologies for the slow response, I'm on parental leave and have quite limited time at the moment. Do you think you could split the SDK update into a separate PR so it is easier to validate in isolation? I recall giving it a quick try back when it was initially released and running into some issue, but that might be fixed now?

[kuzaxak]

Hi @kuzaxak, Apologies for the slow response, I'm on parental leave and have quite limited time at the moment.

That's amazing! Hope you have a great time :)

Do you think you could split the SDK update into a separate PR so it is easier to validate in isolation? I recall giving it a quick try back when it was initially released and running into some issue, but that might be fixed now?

@carlpett Sure, will do. Could you give me a hint what kind of issues you faced?

[carlpett]

Ooops, apparently didn't press the "Comment" button, so this has been sitting in a tab a week 🤦

Thank you for the well wishes! :) I sadly don't remember what didn't work, as it's been a few years. I can't find any old issues that would indicate I actually made a release with it, so it was probably something quite obvious. Tests or even compilation failing, or something like that.