release_build: Remove log output and hardcoded date

[pothos]

The wget log output is too long and the date needs to be dynamic.

Other topic: I see that an old 202309 release was used to fetch previous assets. Let's delete those.

[t-lo]

The wget log output is too long and the date needs to be dynamic.

Thanks for the quick fix - good catch!

Other topic: I see that an old 202309 release was used to fetch previous assets. Let's delete those.

Yeah, that's on me. One run of the github action made it past the build and deleted the "latest" release successfully, but then failed with artifact upload (https://github.com/flatcar/sysext-bakery/actions/runs/7889234176/job/21528613061). I pushed a quick fix to "main" to make the "latest" release re-appear. That again triggered the action, which was then able to complete successfully - but at that time the "latest" release pointed to 202309.

[pothos]

I've now deleted old releases.
Started a new run to see that it uses the last release: https://github.com/flatcar/sysext-bakery/actions/runs/7890342342

[pothos]

Nice how quick it finished 😍 - also reduces environmental impact 🌱 ;)