Add GitAction

Dockerfile.multiarch

@@ -0,0 +1,21 @@
+FROM --platform=$BUILDPLATFORM golang:1.14 as build-env
+
+# xx wraps go to automatically configure $GOOS, $GOARCH, and $GOARM
+# based on TARGETPLATFORM provided by Docker.
+COPY --from=tonistiigi/xx:golang-1.0.0 / /
+
+ARG APP_FOLDER
+
+ADD . ${APP_FOLDER}
+WORKDIR ${APP_FOLDER}
+
+# Compile independent executable using go wrapper from xx:golang
+ARG TARGETPLATFORM
+RUN CGO_ENABLED=0 go build -a -ldflags '-extldflags "-static"' -o /bin/main ./cmd/nfs-subdir-external-provisioner
+
+FROM --platform=$TARGETPLATFORM alpine:3.12
+
+RUN apk update --no-cache && apk add ca-certificates
+COPY --from=build-env /bin/main /app/main
+
+ENTRYPOINT ["/app/main"]