Add github workflow to create upgrades OLM catalog

The upgrades OLM catalog/index has 2 releases in it
to facilitate testing operator updates from the last
feature release to main.

Jira: OSPRH-14819

Author: dprince

hack/catalog-build-olm-upgrade.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+set -ex
+
+MAIN_VERSION=${MAIN_VERSION:-"0.3.0"}
+FEATURE_RELEASE_VERSION=${FEATURE_RELEASE_VERSION:-"0.2.0"}
+FEATURE_RELEASE_BRANCH=${FEATURE_RELEASE_BRANCH:-"18.0-fr2"}
+
+#rm -Rf catalog
+#rm catalog.Dockerfile
+
+  cat >> tmp/catalog-description.md << EOF_CAT
+# openstack-operator
+
+This is the primary operator for OpenStack. It is a "meta" operator, meaning it
+serves to coordinate the other operators for OpenStack by watching and configuring
+their CustomResources (CRs). Additionally installing this operator will automatically
+install all required operator dependencies for installing/managing OpenStack.
+EOF_CAT
+
+
+mkdir catalog
+opm generate dockerfile ./catalog -i registry.redhat.io/openshift4/ose-operator-registry-rhel9:v4.18
+opm init openstack-operator --default-channel=stable-v1.0 --description=tmp/catalog-description.md --output yaml > catalog/index.yaml
+
+opm render  quay.io/openstack-k8s-operators/openstack-operator-bundle:latest --output yaml >> catalog/index.yaml
+opm render quay.io/openstack-k8s-operators/openstack-operator-bundle:${FEATURE_RELEASE_BRANCH}-latest --output yaml >> catalog/index.yaml
+
+  cat >> catalog/index.yaml << EOF_CAT
+---
+schema: olm.channel
+package: openstack-operator
+name: stable-v1.0
+entries:
+  - name: openstack-operator.v${FEATURE_RELEASE_VERSION}
+  - name: openstack-operator.v${MAIN_VERSION}
+    replaces: openstack-operator.v${FEATURE_RELEASE_VERSION}
+EOF_CAT
+opm validate catalog