Fixed mininum version of Openshift (#761)

Author: igor-karpukhin

.github/actions/gen-install-scripts/entrypoint.sh

@@ -70,7 +70,7 @@ else
 fi
 
 # add additional LABELs to bundle.Docker file
-label="LABEL com.redhat.openshift.versions=\"v4.5-v4.10\"\nLABEL com.redhat.delivery.backport=true\nLABEL com.redhat.delivery.operator.bundle=true"
+label="LABEL com.redhat.openshift.versions=\"v4.8\"\nLABEL com.redhat.delivery.backport=true\nLABEL com.redhat.delivery.operator.bundle=true"
 awk -v rep="FROM scratch\n\n$label" '{sub(/FROM scratch/, rep); print}' bundle.Dockerfile > tmp && mv tmp bundle.Dockerfile
 
 operator-sdk bundle validate ./bundle

bundle/metadata/annotations.yaml

@@ -13,3 +13,5 @@ annotations:
   # Annotations for testing.
   operators.operatorframework.io.test.mediatype.v1: scorecard+v1
   operators.operatorframework.io.test.config.v1: tests/scorecard/
+
+  com.redhat.openshift.versions: "v4.8"