K8SPG-837 improve image building process (#1422)

* K8SPG-837 improve image building process

    * add possibility of setting the base image via the build argument

* bump k8s version

Author: hors

build/postgres-operator/Dockerfile

@@ -1,3 +1,5 @@
+ARG BASE_IMAGE=ubi10
+
 FROM --platform=${BUILDPLATFORM} golang:1.25 AS go_builder
 WORKDIR /go/src/github.com/percona/percona-postgresql-operator
 
@@ -45,7 +47,7 @@ RUN mkdir -p build/_output/bin \
 RUN ./bin/license_aggregator.sh ./cmd/...; \
 	cp -r ./licenses /licenses
 
-FROM registry.access.redhat.com/ubi10/ubi-minimal AS ubi10
+FROM registry.access.redhat.com/${BASE_IMAGE}/ubi-minimal AS ubi
 RUN microdnf update -y && microdnf clean all -y
 
 LABEL name="Percona Postgres Operator" \

e2e-tests/build

@@ -50,6 +50,7 @@ build_operator() {
 		--build-arg GIT_BRANCH="${GIT_BRANCH}" \
 		--build-arg BUILD_TIME="${BUILD_TIME}" \
 		--build-arg GO_LDFLAGS="${GO_LDFLAGS}" \
+		--build-arg BASE_IMAGE="${BASE_IMAGE:-ubi10}" \
 		--progress plain \
 		$imgresult \
 		$squash \