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+# Guildhouse SPIRE Plugins — production image.
+#
+# This image is a passive binary container: it is not executed directly.
+# SPIRE server/agent Deployments mount an emptyDir volume and run an
+# initContainer from this image that copies /plugins/ into the shared
+# volume. The runtime layer therefore only needs the plugin binaries
+# themselves plus a minimal `cp` — distroless static-nonroot ships a
+# BusyBox-less runtime, so we use the bookworm slim minimal base here
+# which includes coreutils.
+#
+# Plugin binary paths are /plugins/<name>. SPIRE's HCL plugin_cmd
+# directive expects these exact paths.
+
+FROM golang:1.23.6-bookworm AS builder
+
+WORKDIR /src
+
+# Dependency cache layer — go.mod/go.sum copied first so we only redo
+# `go mod download` when module graph changes, not on every source edit.
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+
+# Build each plugin binary into /plugins/. CGO disabled so the binaries
+# are statically linked and runnable from any base image.
+ENV CGO_ENABLED=0
+ENV GOOS=linux
+ENV GOARCH=amd64
+RUN mkdir -p /plugins && \
+    go build -trimpath -ldflags="-s -w" -o /plugins/oidc-attestor ./cmd/oidc-attestor && \
+    go build -trimpath -ldflags="-s -w" -o /plugins/ssh-credential-composer ./cmd/ssh-credential-composer && \
+    go build -trimpath -ldflags="-s -w" -o /plugins/governance-notifier ./cmd/governance-notifier && \
+    go build -trimpath -ldflags="-s -w" -o /plugins/substrate-keymanager ./cmd/substrate-keymanager
+
+FROM debian:bookworm-slim AS runtime
+
+# No shell commands needed at image boot — this image is inert. The
+# initContainer that uses it supplies its own `cp -r /plugins/ /opt/spire/plugins/`
+# command. We keep the binaries readable by any UID so SPIRE's
+# non-root user can read them out of the shared volume.
+COPY --from=builder /plugins/ /plugins/
+RUN chmod -R a+rx /plugins
+
+LABEL org.opencontainers.image.source="https://git.guildhouse.dev/tking/guildhouse-spire-plugins" \
+      org.opencontainers.image.description="Guildhouse SPIRE plugins: oidc-attestor, ssh-credential-composer, governance-notifier, substrate-keymanager" \
+      org.opencontainers.image.licenses="Apache-2.0"