Dockerfile

# Build the manager binary
FROM --platform=${BUILDPLATFORM} golang:1.20 as builder
ARG TARGETOS
ARG TARGETARCH
ARG LDFLAGS

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 env -w GOPROXY='https://goproxy.io,direct' && go mod download

# Copy the go source
COPY main.go main.go
COPY plugins/ plugins/
COPY pkg/ pkg/

# 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 -ldflags "${LDFLAGS}" -a -o mtls-intercept ./main.go

FROM busybox:glibc
ARG TARGETOS
ARG TARGETARCH

WORKDIR /

COPY --from=builder /workspace/mtls-intercept .

CMD ["/bin/sh"]