Add container build script

.gitignore

@@ -1 +1,2 @@
 /target
+/artifacts

Dockerfile.arm64v8

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+FROM arm64v8/alpine:3.11.3 AS build
+
+COPY relay /relay
+
+RUN \
+ apk add binutils && \
+ strip /relay
+
+FROM arm64v8/alpine:3.11.3
+
+ARG UID=991
+ARG GID=991
+
+RUN \
+ apk add tini && \
+ echo "Etc/UTC" > /etc/localtime && \
+ mkdir -p /opt/relay && \
+ addgroup --gid $GID relay && \
+ adduser -D -u $UID -G relay -h /opt/relay relay && \
+ echo "relay:`head /dev/urandom | tr -dc A-Za-z0-9 | head -c 24 | mkpasswd -s -m sha-256`" | chpasswd && \
+ chown -R relay:relay /opt/relay
+
+COPY --from=build /relay /usr/bin/relay
+
+USER relay
+
+EXPOSE 8080
+
+ENTRYPOINT ["/sbin/tini", "--"]
+CMD ["relay"]

build.sh

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+#!/usr/bin/env bash
+
+BUILD_DATE=$(date)
+VERSION=$1
+
+function require() {
+    if [ "$1" = "" ]; then
+        echo "input '$2' required"
+        print_help
+        exit 1
+    fi
+}
+
+function print_help() {
+    echo "build.sh"
+    echo ""
+    echo "Usage:"
+    echo "      build.sh [version]"
+    echo ""
+    echo "Args:"
+    echo "      version: The version of the current container"
+}
+
+require "$VERSION" "version"
+
+set -xe
+
+# from `cargo install cross`
+cross build \
+    --target aarch64-unknown-linux-musl \
+    --release
+
+mkdir -p artifacts
+cp ./target/aarch64-unknown-linux-musl/release/relay artifacts/relay
+
+# from `sudo docker run --rm --privileged multiarch/qemu-user-static --reset -p yes`
+docker build \
+    --pull \
+    --no-cache \
+    --build-arg BUILD_DATE="${BUILD_DATE}" \
+    --build-arg TAG="${TAG}" \
+    -f "Dockerfile.arm64v8" \
+    -t "asonix/relay:${VERSION}-arm64v8" \
+    -t "asonix/relay:latest-arm64v8" \
+    -t "asonix/relay:latest" \
+    ./artifacts
+
+docker push "asonix/relay:${VERSION}-arm64v8"
+docker push "asonix/relay:latest-arm64v8"
+docker push "asonix/relay:latest"