Cirrus: Simplify use of cache in automation

With the increasingly complex `.cirrus.yml` task relationships, build
cache wasn't always working as intended.  Recently, non-build tasks were
observed assuming authority over `gopath_cache`.  Ref.:
https://github.com/containers/podman/pull/13998#issuecomment-1108834538

Address this by an overall simplification using artifacts instead of
cache.  Using artifacts allows establishing concrete
authorship/authority over cached repo. content.  In this way, dependent
tasks may simply consume the artifact with `curl` instead of relying on
complex caching algorithms.

Also/Minor: Add YAML checking to the pre-commit configuration.

Signed-off-by: Chris Evich <cevich@redhat.com>

.pre-commit-config.yaml

@@ -17,3 +17,4 @@ repos:
       - id: check-byte-order-marker
       - id: check-executables-have-shebangs
       - id: check-merge-conflict
+      - id: check-yaml