sidecars.Dockerfile

# Build the binary
FROM golang:1.24 AS builder
ARG TARGETOS
ARG TARGETARCH
ARG WSTUNNEL_VERSION="10.4.4"

WORKDIR /workspace
# Copy the Go Modules manifests
COPY go.mod go.mod
COPY go.sum go.sum
# 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

# Download and extract wstunnel
RUN curl -L https://github.com/erebe/wstunnel/releases/download/v${WSTUNNEL_VERSION}/wstunnel_${WSTUNNEL_VERSION}_${TARGETOS}_${TARGETARCH}.tar.gz -o /tmp/wstunnel.tar.gz && \
    tar -xzf /tmp/wstunnel.tar.gz -C /usr/local/bin/ && \
    chmod +x /usr/local/bin/wstunnel

# Copy the go source
COPY cmd/ cmd/
COPY api/ api/
COPY internal/ internal/

# Build
# the GOARCH has not a default value to allow the binary be built according to the host where the command
# was called. For example, if we call make docker-build in a local env which has the Apple Silicon M1 SO
# the docker BUILDPLATFORM arg will be linux/arm64 when for Apple x86 it will be linux/amd64. Therefore,
# by leaving it empty we can ensure that the container and binary shipped on it will have the same platform.
RUN CGO_ENABLED=0 GOOS=${TARGETOS:-linux} GOARCH=${TARGETARCH} go build -a -o sidecars cmd/sidecars/main.go

# 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 /
COPY --from=builder /usr/local/bin/wstunnel /usr/local/bin/wstunnel
COPY --from=builder /workspace/sidecars .
USER 65532:65532

ENTRYPOINT ["/sidecars"]