[#65] Provide Dockerfile for arm64v8 architecture

Signed-off-by: Knut Ahlers <knut@ahlers.me>

Dockerfile.arm64v8

@@ -0,0 +1,43 @@
+FROM golang:alpine as builder
+
+ADD . /go/src/github.com/Luzifer/nginx-sso
+WORKDIR /go/src/github.com/Luzifer/nginx-sso
+
+ENV CGO_ENABLED=0 \
+    GOOS=linux \
+    GOARCH=arm64
+
+RUN set -ex \
+ && apk add --update \
+      git \
+ && go install \
+      -ldflags "-X main.version=$(git describe --tags || git rev-parse --short HEAD || echo dev)" \
+      -mod=readonly
+
+
+FROM arm64v8/alpine
+
+LABEL maintainer "Knut Ahlers <knut@ahlers.me>"
+
+RUN set -ex \
+ && apk --no-cache add \
+      bash \
+      ca-certificates \
+      curl \
+ && curl -sSfLo /usr/local/bin/dumb-init "https://github.com/Yelp/dumb-init/releases/download/v1.2.5/dumb-init_1.2.5_aarch64" \
+ && chmod +x /usr/local/bin/dumb-init \
+ && apk --no-cache del --purge \
+      curl
+
+COPY --from=builder /go/bin/nginx-sso                                     /usr/local/bin/
+COPY --from=builder /go/src/github.com/Luzifer/nginx-sso/config.yaml      /usr/local/share/nginx-sso/
+COPY --from=builder /go/src/github.com/Luzifer/nginx-sso/docker-start.sh  /usr/local/bin/
+COPY --from=builder /go/src/github.com/Luzifer/nginx-sso/frontend/*       /usr/local/share/nginx-sso/frontend/
+
+EXPOSE 8082
+VOLUME ["/data"]
+
+ENTRYPOINT ["/usr/local/bin/docker-start.sh"]
+CMD ["--"]
+
+# vim: set ft=Dockerfile: