Use an image with updated service files

This is a temporary workaround that makes the CI green once again. The
referenced image uses the pulp-ci-centos:https base image. On top of it,
there are layers that contain updated service files which allows us to
properly run pulpcore-api and pulpcore-content services.

We will revert the commit once we will be able to resolve the execution
of nested containers.

ref pulp/pulpcore@4def68e#diff-15df6aebb457ef62acf7707d2032bf15dc24646d040d1bf2f892929263ce570dR16
ref pulp/pulp-oci-images#540

[noissue]

.github/workflows/scripts/install.sh

@@ -71,7 +71,7 @@ cat >> vars/main.yaml << VARSYAML
 pulp_settings: {"allowed_content_checksums": ["sha1", "sha224", "sha256", "sha384", "sha512"], "allowed_export_paths": ["/tmp"], "allowed_import_paths": ["/tmp"], "flatpak_index": true}
 pulp_scheme: https
 
-pulp_container_tag: https
+pulp_container_tag: https-pulp_container-ci
 
 VARSYAML