daemon: golang WS hub, REST, gitlab, docker spawner, sqlite (18/18 tests)

daemon/Dockerfile

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+# lvmh daemon image. Build from repo root:
+#   docker build -f daemon/Dockerfile -t lvmh-daemon:latest .
+# To bake the real web UI, copy web/dist over the placeholder first:
+#   cp -r web/dist daemon/webdist/
+FROM golang:1.24-alpine AS build
+WORKDIR /src
+COPY daemon/go.mod daemon/go.sum ./
+RUN go mod download
+COPY daemon/ ./
+RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o /out/lvmh-daemon .
+
+FROM alpine:3.21
+RUN apk add --no-cache ca-certificates git
+WORKDIR /app
+COPY --from=build /out/lvmh-daemon /app/lvmh-daemon
+# Placeholder UI; replace via build (cp web/dist daemon/webdist) or mount at
+# /app/web-dist and rely on the --webdist default.
+COPY --from=build /src/webdist /app/web-dist
+VOLUME /data
+EXPOSE 8686
+ENV LVMH_DB=/data/lvmh.db
+ENTRYPOINT ["/app/lvmh-daemon"]