Add Dockerfile to build without operator-sdk

--Add Dockerfile to root directory
--Add makefile that hooks into tmp/build/build.sh
--Use this Dockerfile to fulfill OSBS requirement for containers

Author: kevinrizza

Dockerfile

@@ -0,0 +1,18 @@
+
+FROM openshift/origin-release:golang-1.10 as builder
+WORKDIR /go/src/github.com/operator-framework/operator-marketplace
+COPY . .
+RUN make osbs-build
+
+FROM alpine:3.6
+RUN useradd marketplace-operator
+USER marketplace-operator
+COPY --from=builder /go/src/github.com/operator-framework/operator-marketplace/tmp/_output/bin/marketplace-operator /usr/bin
+
+LABEL io.k8s.display-name="OpenShift Marketplace Operator" \
+      io.k8s.description="This is a component of OpenShift Container Platform and manages the OpenShift Marketplace." \
+      io.openshift.tags="openshift,marketplace" \
+      maintainer="AOS Marketplace <aos-marketplace@redhat.com>"
+
+# entrypoint specified in operator.yaml as `marketplace-operator`
+CMD ["/usr/bin/marketplace-operator"]

Makefile

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+all: osbs-build
+
+osbs-build:
+	# hack/build.sh
+	./tmp/build/build.sh