fluxrec: personal Miniflux article recommender

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+# fluxrec serve container (rss + status on :8080, state in /data).
+#
+#   build:  docker build -f Containerfile -t fluxrec .
+#   run:    docker run -d --name fluxrec \
+#             --env-file /srv/fluxrec/env \
+#             -v /srv/fluxrec:/data \
+#             -p 127.0.0.1:8080:8080 \
+#             fluxrec
+#
+# The env file holds MINIFLUX_URL and MINIFLUX_TOKEN (plus optional TZ —
+# refresh times are computed in it; default UTC, tzdata is installed). The
+# env file lives on the server only, never in this repo. /data holds
+# model.json (scp'd by `just deploy`), cursor.json and runs.jsonl.
+FROM golang:1.25-alpine AS build
+WORKDIR /src
+COPY . .
+RUN CGO_ENABLED=0 go build -trimpath -o /out/fluxrec .
+
+FROM alpine:3.21
+RUN apk add --no-cache tzdata \
+    && adduser -D fluxrec \
+    && mkdir -p /data && chown fluxrec:fluxrec /data
+USER fluxrec
+COPY --from=build /out/fluxrec /usr/local/bin/fluxrec
+EXPOSE 8080
+ENTRYPOINT ["fluxrec", "serve", \
+    "--model", "/data/model.json", \
+    "--cursor", "/data/cursor.json", \
+    "--runs", "/data/runs.jsonl"]
+# Override refresh times / rec feed ID via extra args after the image name, e.g.:
+#   docker run ... fluxrec --refresh-at "06:00,12:00,18:00" --rec-feed-id 123