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perf: cross-compile arm64 instead of building under QEMU #23

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Merged
JustMaris merged 1 commit into from
Oct 4, 2026
Merged

perf: cross-compile arm64 instead of building under QEMU #23

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6 changes: 4 additions & 2 deletions Dockerfile
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Original file line number Diff line number Diff line change
@@ -1,10 +1,12 @@
# Static CGO-free binary; distroless/static brings CA certs and nothing else.
FROM golang:1.27-trixie AS builder
# Cross-compile on the runner's own arch; building arm64 under QEMU took minutes.
FROM --platform=$BUILDPLATFORM golang:1.27-trixie AS builder
ARG TARGETOS TARGETARCH
WORKDIR /src
COPY go.mod go.sum ./
RUN go mod download
COPY . .
RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o /github-actions-runner-exporter .
RUN CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=$TARGETARCH go build -trimpath -ldflags="-s -w" -o /github-actions-runner-exporter .

FROM gcr.io/distroless/static-debian13:nonroot
COPY --from=builder /github-actions-runner-exporter /github-actions-runner-exporter
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