ci: move container images to the org registry namespace

Build destination, both builder-image references and the three publish
pins now point at novoyuuparosk-wiki/*. The publish pins name a tag that
does not exist in the new namespace until this run's build job pushes it
and the pin job rewrites them, so publishes are briefly broken mid-run.

.gitea/workflows/build-kaniko-act.yml

@@ -19,9 +19,10 @@ jobs:
   build:
     runs-on: ubuntu-latest
     container:
-      # BOOTSTRAP: still the pre-migration image under `mikkeli`, because the
-      # org copy is what this run creates. Flip to the org path once it exists.
-      image: pi5-16.local:3005/mikkeli/kaniko-act:v1.23.2-r2
+      # Self-hosting: the current kaniko-act builds its own successor. The very
+      # first org build ran from `mikkeli/kaniko-act:v1.23.2-r2` instead, since
+      # this path did not exist yet.
+      image: pi5-16.local:3005/novoyuuparosk-wiki/kaniko-act:v1.23.2-r2
 
     steps:
       - name: Fetch source, build, push