Merge pull request 'ci: use CA-baked plugin-docker-buildx image for artifactapi push' (#3) from benvin/buildx-ca-plugin-image into main

Reviewed-on: #3

.woodpecker/docker.yaml

@@ -1,6 +1,6 @@
 # Build and push the pdbmux container image on a v* tag. pdbmux is a k8s-only
 # daemon (deployed via argocd-apps), so it ships as an image. Mirrors the estate
-# convention: the woodpeckerci/plugin-docker-buildx plugin pushes to the
+# convention: the CA-baked plugin-docker-buildx image pushes to the
 # artifactapi local docker registry (unauthenticated in-cluster push).
 when:
   - event: tag
@@ -8,7 +8,7 @@ when:
 
 steps:
   - name: docker
-    image: woodpeckerci/plugin-docker-buildx
+    image: artifactapi.k8s.syd1.au.unkin.net/docker-internal/plugin-docker-buildx:latest
     settings:
       registry: artifactapi.k8s.syd1.au.unkin.net
       repo: artifactapi.k8s.syd1.au.unkin.net/docker-internal/pdbmux