Merge pull request kubernetes-sigs#2 from arjunrn/openshift-dockerfile

Added Dockerfile used in Openshift builds

Dockerfile.openshift

@@ -0,0 +1,24 @@
+# TODO: Switch to UBI golang image when 1.17 is released
+# FROM registry.access.redhat.com/ubi8/go-toolset:latest AS builder
+FROM golang:1.17 AS builder
+
+WORKDIR /workspace
+
+# Copy the dependencies which don't change frequently
+COPY go.mod go.mod
+COPY go.sum go.sum
+COPY vendor vendor
+
+# Copy the source files
+COPY apis apis
+COPY main.go main.go
+COPY controllers controllers
+COPY pkg pkg
+COPY webhooks webhooks
+
+# Build the controller
+RUN go build -mod=vendor -o bin/controller main.go
+
+FROM registry.access.redhat.com/ubi8/ubi-micro:latest
+COPY --from=builder /workspace/bin/controller /usr/bin/controller
+ENTRYPOINT ["/usr/bin/controller"]