Fix bindata build step and parameterize docker build

frontend/Dockerfile

@@ -0,0 +1,19 @@
+FROM golang:buster AS step_0
+#
+# IMAGE_ARCH is the binary format of the final output
+# BUILD_ARCH is the binaary format of the build host
+#
+ARG IMAGE_ARCH=amd64
+ARG BUILD_ARCH=amd64
+#
+ENV CGO_ENABLED=0 GOOS=linux GOARCH=$IMAGE_ARCH GO111MODULE=on
+WORKDIR /root
+COPY . .
+# go-bindata is run on the build host as part of the go generate step
+RUN GOARCH=$BUILD_ARCH go get -u github.com/kevinburke/go-bindata/...
+RUN go generate
+RUN go build -ldflags "-w -s" -o /frontend
+
+FROM scratch AS step_1
+COPY --from=step_0 /frontend /
+ENTRYPOINT ["/frontend"]