Multi-arch Docker image buildkit

Dockerfile

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+FROM alpine:3.14 as intermediate
+
+RUN mkdir /src
+WORKDIR /src
+
+# Install the build tools
+RUN apk add git go make
+
+# Fetch the source
+RUN git clone https://github.com/slackhq/nebula.git
+
+# Compile the Linux binaries for all platforms
+WORKDIR /src/nebula
+RUN echo 'bin-linux: $(ALL_LINUX:%=build/%/nebula) $(ALL_LINUX:%=build/%/nebula-cert)' >> Makefile
+RUN make bin-linux
+
+# Start from a clean image
+FROM alpine:3.14
+
+RUN mkdir /app
+WORKDIR /app
+
+# Copy over the compiled binaries
+COPY --from=intermediate /src/nebula/build ./
+
+# Rename the directories from `go env` format to `uname` format
+RUN mv linux-amd64 linux-x86_64
+
+COPY docker-entrypoint.sh entrypoint.sh
+ENTRYPOINT [ "/bin/sh", "/app/entrypoint.sh" ]

docker-entrypoint.sh

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+#!/bin/sh
+
+# Run the platform-specific binary
+"/app/linux-$(uname -m)/nebula"