Remove alpine base image and use UBI as default

Dockerfile.release

@@ -1,10 +1,21 @@
-FROM alpine:latest as alpine
-RUN apk add -U --no-cache ca-certificates
+FROM registry.access.redhat.com/ubi8/ubi-minimal:8.3
 
-FROM scratch
-MAINTAINER MinIO Development "dev@min.io"
+LABEL name="MinIO" \
+      vendor="MinIO Inc <dev@min.io>" \
+      maintainer="MinIO Inc <dev@min.io>" \
+      version="v0.12.1" \
+      release="v0.12.1" \
+      summary="KES is a stateless and distributed key-management system for high-performance applications." \
+      description="KES as the bridge between modern applications - running as containers on Kubernetes - and centralized KMS solutions. Therefore, KES has been designed to be simple, scalable and secure by default. It has just a few knobs to tweak instead of a complex configuration and does not require a deep understanding of secure key-management or cryptography."
+
+RUN \
+    microdnf update --nodocs && \
+    microdnf install ca-certificates --nodocs && \
+    microdnf clean all && \
+    mkdir /licenses && \
+    curl -s -q https://raw.githubusercontent.com/minio/kes/master/CREDITS -o /licenses/CREDITS && \
+    curl -s -q https://raw.githubusercontent.com/minio/kes/master/LICENSE -o /licenses/LICENSE
 
-COPY --from=alpine /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
 COPY kes /kes
 
 EXPOSE 7373