revert: go back to ubi9

Author: p5

.github/workflows/build.yml

@@ -52,7 +52,7 @@ jobs:
     needs: generate_matrix
     timeout-minutes: 30
     container:
-      image: quay.io/centos/centos:stream10
+      image: redhat/ubi9:latest
       options: --privileged
     strategy:
       fail-fast: false
@@ -68,8 +68,7 @@ jobs:
           dnf install -y \
             git \
             podman \
-            skopeo \
-            which
+            skopeo
 
           # Rechunk requires sudo, so we need to create a dummy sudo
           echo -e "#!/bin/bash\nexec \"\$@\"" > /usr/bin/sudo