Setup new daily builds

[zeha]

We want a new daily build setup.

Goals:

• daily.grml.org will be served by web01.grml.org
• daily builds are available again on daily.grml.org
• daily builds can again serve as basis for release builds

Known todos:

• [ ] check if all artifacts are gathered
• [ ] build flavours: small and full
• [x] drop grml32
• [x] build all archs (new!)
• [x] install arch-specific deps from grml-live
• [ ] copy all artifacts together and serve them to daily.grml.org - should happen only for scheduled builds
• [ ] skip builds for manually triggered jobs to save time - TBD: do we want this?
• [ ] setup release pipeline
• [ ] reconsider "base files" - are we fine with "just" debootstrapping every time?
• [x] install grml-live-addons
• [x] check if we need configuration for grml-live (answer: no)
• [ ] replace fai?

[zeha]

@mika wdyt?

Especially about these points:

• could we drop "base files"?
• should daily.g.o be served by web01.g.o?

[zeha]

Added most arch-specific deps except for grub-pc-bin [amd64 i386], which seems a bit unclear where/how it is used.