Update ubi micro as the base image (#149)

* Updating base image as micro image

Dockerfile.podman

@@ -10,24 +10,16 @@ RUN GOOS=linux CGO_ENABLED=0 GOARCH=amd64 go build -ldflags '-extldflags "-stati
 # Print the version
 RUN go run core/semver/semver.go -f mk
 
+
 # Dockerfile to build Unity CSI Driver
-# Tag corresponding to digest ab03679e683010d485ef0399e056b09a38d7843ba4a36ee7dec337dd0037f7a7 is 8.7-1085
-FROM registry.access.redhat.com/ubi8/ubi-minimal@sha256:ab03679e683010d485ef0399e056b09a38d7843ba4a36ee7dec337dd0037f7a7 as driver
-# dependencies, following by cleaning the cache
-RUN microdnf update -y \
-	&& \
-	microdnf install -y e2fsprogs xfsprogs nfs-utils device-mapper-multipath hostname \
-    && \
-    microdnf clean all \
-    && \
-    rm -rf /var/cache/run
+# Fetching the base ubi micro image with the require packges committed using buildah
+FROM localhost/csiunity-ubimicro as driver
+
 COPY --from=builder /go/src/csi-unity/bin/csi-unity /
 COPY csi-unity/scripts/run.sh /
 RUN chmod 777 /run.sh
 ENTRYPOINT ["/run.sh"]
 
-RUN microdnf install -y tar
-
 # final stage
 FROM driver as final
 

build.sh

@@ -29,6 +29,7 @@ function git_version {
 }
 
 function build_image {
+   bash build_ubi_micro.sh registry.access.redhat.com/ubi8/ubi-micro
    echo $BUILDCMD build -t ${IMAGE_NAME}:${IMAGE_TAG} .
    (cd .. && $BUILDCMD build -t ${IMAGE_NAME}:${IMAGE_TAG} --build-arg GOPROXY=$GOPROXY -f csi-unity/Dockerfile.podman . --format=docker)
    echo $BUILDCMD tag ${IMAGE_NAME}:${IMAGE_TAG} ${IMAGE_REPO}/${IMAGE_REPO_NAMESPACE}/${IMAGE_NAME}:${IMAGE_TAG}

build_ubi_micro.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+microcontainer=$(buildah from $1)
+micromount=$(buildah mount $microcontainer)
+dnf install --installroot $micromount --releasever=8 --nodocs --setopt install_weak_deps=false --setopt=reposdir=/etc/yum.repos.d/ e2fsprogs which xfsprogs nfs-utils device-mapper-multipath util-linux hostname -y
+dnf clean all --installroot $micromount
+buildah umount $microcontainer
+buildah commit $microcontainer csiunity-ubimicro