Use distroless/static image instead of distroless/base since glibc is not used

[vilmosmartinek]

Description of your changes

This pull request changes the base image in the template to gcr.io/distroless/static-debian12:nonroot.

Fixes #87

I have:

• Read and followed Crossplane's contribution process.
  - [ ] Added or updated unit tests for my change.

[jbw976]

In general, I think this will be a good improvement to make, as briefly discussed on crossplane-contrib/function-auto-ready#49 (review). Thank you for your initiative and thoroughness! 🙇‍♂️

There's a few PRs now from @vilmosmartinek across the ecosystem of functions to make this same change, so let's test those and build confidence in them, and then we can merge this template change as well.

Other open PRs for this same change:

• Use distroless/static image instead of distroless/base since glibc is not used crossplane-contrib/function-auto-ready#49
• Use distroless/static image instead of distroless/base since glibc is not used crossplane-contrib/function-patch-and-transform#157
• Use distroless/static image instead of distroless/base since glibc is not used crossplane-contrib/function-environment-configs#52
• Use distroless/static image instead of distroless/base since glibc is not used crossplane-contrib/function-go-templating#134

[jbw976]

Awesome, we've merged all the updates to the specific functions that you opened @vilmosmartinek, let's get this update to the template repo merged in too 😉

[jbw976]

Tracking list for the function releases that will include this static distroless change:

• ✅ https://github.com/crossplane-contrib/function-auto-ready/releases/tag/v0.4.0
  • https://marketplace.upbound.io/functions/crossplane-contrib/function-auto-ready/v0.4.0
• ✅ https://github.com/crossplane-contrib/function-patch-and-transform/releases/tag/v0.8.0
  • https://marketplace.upbound.io/functions/crossplane-contrib/function-patch-and-transform/v0.8.0
• ✅ https://github.com/crossplane-contrib/function-environment-configs/releases/tag/v0.2.0
  • https://marketplace.upbound.io/functions/crossplane-contrib/function-environment-configs/v0.2.0
• ✅ https://github.com/crossplane-contrib/function-go-templating/releases/tag/v0.9.0
  • https://marketplace.upbound.io/functions/crossplane-contrib/function-go-templating/v0.9.0

[jbw976]

All releases with this static distroless change are complete - thanks again @vilmosmartinek for taking the initiative to make this improvement and for testing it to help ensure quality as well! 🙇‍♂️

[vilmosmartinek]

Thank you very much @jbw976 and @phisco for reviewing all these PRs and creating the new releases for each provider! I truly appreciate your help, feedback, and effort in making this improvement possible. 🙇