Build from source and add pre and post install for build docker container image

src/build.sh

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+#!/bin/sh
+#
+# Copyright (c) 2021 Sambo Chea <sombochea@cubetiqs.com
+# MIT
+#
+
+set -ex
+DOCKER_USERNAME="${DOCKER_USERNAME:-cubetiq}"
+ALPINE_VERSION="${ALPINE_VERSION:-3.13.3}"
+PACKAGES="apk-tools ca-certificates ssl_client"
+
+MKROOTFS="/tmp/alpine-make-rootfs"
+BUILD_TAR="/tmp/docker/alpine-rootfs-${ALPINE_VERSION}.tar.gz"
+DOCKER_ROOT=$(dirname $BUILD_TAR)
+PRE_INSTALL="./pre-install.sh"
+POST_INSTALL="./post-install.sh"
+
+mkdir $DOCKER_ROOT
+MS_ROOT="${DOCKER_ROOT}/../microscanner"
+mkdir $MS_ROOT
+
+# Build from alpine rootfs
+# Download rootfs builder and verify it.
+wget https://raw.githubusercontent.com/alpinelinux/alpine-make-rootfs/v0.5.1/alpine-make-rootfs -O "$MKROOTFS"
+echo "a7159f17b01ad5a06419b83ea3ca9bbe7d3f8c03 $MKROOTFS" | sha1sum -c -
+chmod +x ${MKROOTFS}
+
+sudo ${MKROOTFS} --mirror-uri http://dl-2.alpinelinux.org/alpine \
+	--branch "v${ALPINE_VERSION}" \
+	--packages "$PACKAGES" \
+	--script-chroot \
+	"$BUILD_TAR" \
+	"$POST_INSTALL"
+
+# Create Dockerfile
+cat <<DOCKERFILE > "${DOCKER_ROOT}/Dockerfile"
+FROM scratch
+USER worker
+ADD $(basename $BUILD_TAR) /
+CMD ["/bin/sh"]
+DOCKERFILE
+
+cd $DOCKER_ROOT
+docker build --no-cache -t "${DOCKER_USERNAME}/alpine:${ALPINE_VERSION}" .
+cd -
+
+docker build  --build-arg BASE_IMAGE="${DOCKER_USERNAME}/alpine:${ALPINE_VERSION}" --build-arg MS_TOKEN="${MS_TOKEN}" - <<'DOCKERFILE'
+ARG BASE_IMAGE
+FROM $BASE_IMAGE
+ARG MS_TOKEN
+RUN wget https://get.aquasec.com/microscanner -O /home/worker/microscanner \
+  && echo "8e01415d364a4173c9917832c2e64485d93ac712a18611ed5099b75b6f44e3a5  /home/worker/microscanner" | sha256sum -c - \
+  && chmod +x /home/worker/microscanner \
+  && /home/worker/microscanner $MS_TOKEN
+DOCKERFILE

src/post-install.sh

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+#!/bin/sh
+#
+# Copyright (c) 2021 Sambo Chea <sombochea@cubetiqs.com
+# MIT
+#
+
+echo "Post-installation..."
+
+# Catch errors
+set -ex
+
+# Ensure certs are up to date
+update-ca-certificates
+
+# make saure we have the latest packages
+/sbin/apk update
+/sbin/apk upgrade
+
+# Add a standard user.
+adduser -D -u1000 worker

src/pre-install.sh

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+#!/bin/sh
+#
+# Copyright (c) 2021 Sambo Chea <sombochea@cubetiqs.com
+# MIT
+#
+
+echo "Pre-installation..."