Remove alpine base and use UBI as the default base image (#480)

Co-authored-by: Daniel Valdivia <hola@danielvaldivia.com>

Dockerfile.release

@@ -1,12 +1,21 @@
-FROM ubuntu:18.04 as certs
+FROM registry.access.redhat.com/ubi8/ubi-minimal:8.3
 
-RUN apt-get update -y && apt-get install -y ca-certificates
+COPY CREDITS /licenses/CREDITS
+COPY LICENSE /licenses/LICENSE
 
-FROM scratch
-MAINTAINER MinIO Development "dev@min.io"
+LABEL name="MinIO" \
+      vendor="MinIO Inc <dev@min.io>" \
+      maintainer="MinIO Inc <dev@min.io>" \
+      version="v0.4.6" \
+      release="v0.4.6" \
+      summary="A graphical user interface for MinIO" \
+      description="MinIO object storage is fundamentally different. Designed for performance and the S3 API, it is 100% open-source. MinIO is ideal for large, private cloud environments with stringent security requirements and delivers mission-critical availability across a diverse range of workloads."
+
+RUN \
+     microdnf update --nodocs && \
+     microdnf install ca-certificates --nodocs
+     
 EXPOSE 9090
 COPY console /console
 
-COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
-
 ENTRYPOINT ["/console"]

Dockerfile.release.ubi

@@ -1,21 +0,0 @@
-FROM registry.access.redhat.com/ubi8/ubi-minimal:8.3
-
-COPY CREDITS /licenses/CREDITS
-COPY LICENSE /licenses/LICENSE
-
-LABEL name="MinIO" \
-      vendor="MinIO Inc <dev@min.io>" \
-      maintainer="MinIO Inc <dev@min.io>" \
-      version="v0.4.6" \
-      release="v0.4.6" \
-      summary="A graphical user interface for MinIO" \
-      description="MinIO object storage is fundamentally different. Designed for performance and the S3 API, it is 100% open-source. MinIO is ideal for large, private cloud environments with stringent security requirements and delivers mission-critical availability across a diverse range of workloads."
-
-RUN \
-     microdnf update --nodocs && \
-     microdnf install ca-certificates --nodocs
-     
-EXPOSE 9090
-COPY console /console
-
-ENTRYPOINT ["/console"]