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docker/Dockerfile

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+# syntax=docker/dockerfile:1
+
+# ---- Stage 1: compile libultrahdr (ultrahdr_app) --------------------------
+FROM alpine:3.21 AS uhdr-build
+
+RUN apk add --no-cache \
+        git cmake make g++ nasm pkgconf libjpeg-turbo-dev
+
+WORKDIR /build
+# Pin to a commit once you've confirmed it works for you — HEAD can move.
+RUN git clone --depth 1 https://github.com/google/libultrahdr.git
+
+RUN cmake -G "Unix Makefiles" -DUHDR_WRITE_XMP=ON \
+        -S libultrahdr -B libultrahdr/build \
+    && cmake --build libultrahdr/build -j"$(nproc)"
+
+# ---- Stage 2: runtime -------------------------------------------------------
+FROM python:3.11-alpine
+
+RUN apk add --no-cache exiftool libjpeg-turbo libstdc++
+
+COPY --from=uhdr-build /build/libultrahdr/build/ultrahdr_app /usr/local/bin/ultrahdr_app
+RUN chmod +x /usr/local/bin/ultrahdr_app
+
+WORKDIR /app
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY main.py .
+COPY app/ app/
+COPY templates/ templates/
+COPY static/ static/
+COPY LICENSE VERSION ./
+COPY docker/entrypoint.sh /app/entrypoint.sh
+RUN chmod +x /app/entrypoint.sh
+
+RUN adduser -D runner && mkdir -p /app/jobs && chown -R runner:runner /app
+USER runner
+
+EXPOSE 5000
+ENTRYPOINT ["/app/entrypoint.sh"]