First Commit

Dockerfile

@@ -0,0 +1,44 @@
+# syntax=docker/dockerfile:1.7
+
+########################
+# builder
+########################
+FROM --platform=$BUILDPLATFORM golang:1.22-bookworm AS build
+ARG TARGETOS
+ARG TARGETARCH
+ARG TARGETVARIANT
+
+WORKDIR /src
+
+# 1) Copy ONLY go.mod first and materialize go.sum inside the image
+COPY go.mod ./
+# Produce go.sum (and module cache) before copying the rest
+RUN --mount=type=cache,target=/root/.cache/go-build \
+    go mod download && go mod verify
+
+# 2) Now copy the rest of the source
+COPY . .
+
+# (Optional but nice) ensure module graph is tidy (updates go.sum if needed)
+RUN --mount=type=cache,target=/root/.cache/go-build \
+    go mod tidy
+
+# 3) Build (with ARM variant handling)
+ENV CGO_ENABLED=0
+RUN --mount=type=cache,target=/root/.cache/go-build \
+    if [ "${TARGETARCH}${TARGETVARIANT}" = "armv6" ]; then export GOARM=6; fi && \
+    if [ "${TARGETARCH}${TARGETVARIANT}" = "armv7" ]; then export GOARM=7; fi && \
+    GOOS=$TARGETOS GOARCH=$TARGETARCH go build -trimpath -ldflags="-s -w" \
+      -o /out/greencoast-shard ./cmd/shard
+
+########################
+# runtime
+########################
+FROM gcr.io/distroless/base-debian12:nonroot
+WORKDIR /app
+COPY --from=build /out/greencoast-shard /app/greencoast-shard
+COPY configs/shard.sample.yaml /app/shard.yaml
+VOLUME ["/var/lib/greencoast"]
+EXPOSE 8080 8081
+USER nonroot:nonroot
+ENTRYPOINT ["/app/greencoast-shard","--config","/app/shard.yaml"]