feat: update images in template Dockerfile

[philiplb]

This commit updates the images used in the template Dockerfile to the latest versions as of writing:

• golang:1.25.10: the latest 1.25 version which is used in the initial go.mod file generated by Go 1.26

• gcr.io/distroless/static:nonroot

[philiplb]

Re-requesting the review as the first time the check "test (ubuntu-latest)" failed with a

Error: A branch or tag with the name 'feature/update-docker-images' could not be found

So to retrigger the check, I edited the commit message and force pushed.

[philiplb]

Welp, it failed again with the same error. Maybe the pipeline can't handle PRs from forked repos yet? I will investigate.

[zalgonoise]

Welp, it failed again with the same error. Maybe the pipeline can't handle PRs from forked repos yet? I will investigate.

Yes, it looks like the pipeline only fetches the branches in the repo, I will take a look later if Marvin doesn't get to it first :) thanks for contributing

[philiplb]

Welp, it failed again with the same error. Maybe the pipeline can't handle PRs from forked repos yet? I will investigate.

Yes, it looks like the pipeline only fetches the branches in the repo, I will take a look later if Marvin doesn't get to it first :) thanks for contributing

Awesome, thank you :)

[MarvinJWendt]

Hey, thanks for contributing! Maybe we could already upgrade to go 1.26 :)
I'll be on vacation soon, we can ignore the pipeline errors for now.

[philiplb]

I've set it to the latest version of Go 1.25 because that's what you get in your go.mod file after running go mod init with an installed Go 1.26. So in order to make the go.mod match with the Dockerfile, I went with 1.25.