add new page documenting the different rebuilders

Signed-off-by: Holger Levsen <holger@layer-acht.org>

_data/docs.yml

@@ -39,3 +39,4 @@
   - checksums
   - embedded-signatures
   - sharing-certifications
+  - rebuilders

_docs/rebuilders.md

+---
+title: Rebuilders
+layout: docs
+permalink: /docs/rebuilders/
+---
+
+This page is trying to document the different tools for rebuilding:
+
+# orchestrators
+- <https://github.com/kpcyrd/rebuilderd> (Agnostic)
+- <https://github.com/fepitre/package-rebuilder>
+
+# rebuilder-backends
+- <https://github.com/archlinux/archlinux-repro> (Arch Linux)
+- <https://github.com/archlinux/devtools/blob/master/makerepropkg.in> (Arch Linux)
+- <https://salsa.debian.org/debian/devscripts/-/blob/master/scripts/debrebuild.pl> (Debian)
+- <https://github.com/fepitre/debrebuild> (Python rewrite of the above, +more)
+- <https://github.com/fepitre/rpmreproduce> (Fedora on Qubes OS)
+
+# clients/frontends
+- <https://gitlab.archlinux.org/archlinux/rebuilderd-website> (Agnostic)
+- <https://github.com/kpcyrd/ismyarchverifiedyet> (Arch Linux)
+- <https://github.com/archlinux/arch-repro-status> (Arch Linux)
+
+# verifiers?
+ (I wonder how we can contrast a more thorough attestation verification vs regular client/frontends)
+- <https://github.com/tweag/trustix>
+- <https://github.com/in-toto/apt-transport-in-toto>
+- <https://github.com/fepitre/dnf-plugin-in-toto>
+
+# outside the above model
+for OCaml / OPAM we have some infrastructure as well - the builder (capturing everything [installed packages, environment variables, sources used]) is `orb build`, the rebuilder is `orb rebuild` (from <https://github.com/roburio/orb).
+for scheduling we're currently using builder (<https://github.com/roburio/builder>) and have a web frontend (<https://git.robur.io/robur/builder-web>) -- live at <https://builds.robur.coop>
+