Explicitly provide ubi-minimal tag

The :latest ubi-minimal tag will not work with cekit due to cekit/cekit#637
and the underlying microdnf issue
https://bugzilla.redhat.com/show_bug.cgi?id=1769831, therefore it's
necessary to ensure that the last working tag, 8.0-213, is used.

In general it is good practice to use a specific image tag for
reproducible builds, so we should continue to explicitly provide the tag
in the future.

image.yaml

@@ -2,7 +2,7 @@ schema_version: 1
 name: infinispan/server
 version: 10.1.0.CR1-1
 description: Infinispan Server
-from: registry.redhat.io/ubi8/ubi-minimal
+from: registry.redhat.io/ubi8/ubi-minimal:8.0-213
 artifacts:
 - name: config-generator.jar
   url: https://repository.jboss.org/org/infinispan/images/config-generator/1.1.0.CR1/config-generator-1.1.0.CR1.jar