Dockerfile

# ---------------------------------------------------------#
#                   Build Harness image                    #
# ---------------------------------------------------------#
FROM --platform=$BUILDPLATFORM golang:1.25.1-alpine AS builder

# Setup working dir
WORKDIR /app

ARG TARGETOS
ARG TARGETARCH

# Get dependencies - will also be cached if we won't change mod/sum
COPY go.mod .
COPY go.sum .

# COPY the source code as the last step
COPY . .

# set required build flags
RUN --mount=type=cache,target=/root/.cache/go-build \
    --mount=type=cache,target=/go/pkg \
    CGO_ENABLED=0 \
    GOOS=$TARGETOS GOARCH=$TARGETARCH \
    go build -o mcp-server ./cmd/harness-mcp-server

### Pull CA Certs
FROM --platform=$BUILDPLATFORM alpine:latest AS cert-image

RUN apk --update add ca-certificates

# ---------------------------------------------------------#
#                   Create final image                     #
# ---------------------------------------------------------#
FROM alpine:3.21 AS final

# setup app dir and its content
WORKDIR /app
VOLUME /data

ENV XDG_CACHE_HOME=/data

COPY --from=builder /app/mcp-server /app/mcp-server
COPY --from=cert-image /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt

ENTRYPOINT ["/app/mcp-server"]
CMD ["stdio"]