Dockerfile

# Build the manager binary
FROM golang:1.26.3@sha256:2d6c80227255c3112a4d08e67ba98e58efd3846daf15d9d7d4c389565d881b1a AS builder
ARG TARGETOS
ARG TARGETARCH
# cycle 54 — release pipeline 이 `docker build --build-arg VERSION=vX.Y.Z` 등으로
# 주입. 미주입 시 default ("dev"/"none"/"unknown") — runtime --version 출력에서
# 즉시 식별 가능. cycle 53 의 cmd/main.go ldflags var 와 정합.
ARG VERSION=dev
ARG COMMIT=none
ARG BUILD_DATE=unknown

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

# Copy the Go source (relies on .dockerignore to filter)
COPY . .

# Build
# the GOARCH has no default value to allow the binary to 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 \
    -ldflags "-X main.version=${VERSION} -X main.commit=${COMMIT} -X main.date=${BUILD_DATE}" \
    -o manager cmd/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@sha256:963fa6c544fe5ce420f1f54fb88b6fb01479f054c8056d0f74cc2c6000df5240
WORKDIR /
COPY --from=builder /workspace/manager .
USER 65532:65532

ENTRYPOINT ["/manager"]