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Dockerfile
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FROM golang:1.22 AS build-server
WORKDIR /workspace/server
# Copy the Go Modules manifests
COPY ./go.* .
# cache deps before building and copying source so that we don't need to re-download as much
# and so that source changes don't invalidate our downloaded layer
RUN go mod download
# Copy the go source
COPY ./server/*.go ./
# Test
RUN go test -v ./...
# Build
RUN CGO_ENABLED=0 GOOS=linux go build -a -o well-known ./
FROM alpine AS downloader
ARG TARGETPLATFORM
ARG TINI_VERSION=v0.19.0
RUN if [ "$TARGETPLATFORM" = "linux/amd64" ]; then ARCHITECTURE=amd64; elif [ "$TARGETPLATFORM" = "linux/arm/v7" ]; then ARCHITECTURE=arm; elif [ "$TARGETPLATFORM" = "linux/arm64" ]; then ARCHITECTURE=arm64; else ARCHITECTURE=amd64; fi \
&& wget -O /usr/local/bin/tini https://github.com/krallin/tini/releases/download/${TINI_VERSION}/tini-static-${ARCHITECTURE}
RUN chmod +x /usr/local/bin/tini
#
# Use distroless as minimal base image to package the manager binary
# Refer to https://github.com/GoogleContainerTools/distroless for more details
FROM gcr.io/distroless/static:nonroot
WORKDIR /app
COPY --from=downloader /usr/local/bin/tini /app/tini
COPY --from=build-server /workspace/server/well-known /app/well-known
USER 65532:65532
ENTRYPOINT ["/app/tini", "--", "/app/well-known"]