Initial: MPQ patch packager (Gitea Action, StormLib-based)

A BigWigs-style CI packager for WoW MPQ patch archives. Reads an mpq.yaml
manifest, stages files, builds a vanilla-1.12-compatible patch-X.mpq via
StormLib, and (in the example workflow) attaches it to a Gitea release on tag.

Dockerfile

@@ -0,0 +1,42 @@
+# mpq-packager — build image for the Gitea Action.
+#
+# Stage 1 builds StormLib (the MoPaQ library MPQEditor itself is built on) and
+# our small `mpqpack` binary against it. Stage 2 is a slim runtime carrying the
+# binary plus Python for the orchestration layer.
+
+FROM debian:bookworm-slim AS build
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        git cmake g++ make zlib1g-dev libbz2-dev ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /build
+# Pin StormLib to a known-good tag for reproducible builds.
+ARG STORMLIB_REF=v9.25
+RUN git clone --depth 1 --branch "${STORMLIB_REF}" \
+        https://github.com/ladislav-zezula/StormLib.git
+RUN cmake -S StormLib -B StormLib/build \
+        -DCMAKE_BUILD_TYPE=Release \
+        -DBUILD_SHARED_LIBS=OFF \
+        -DWITH_LIBTOMCRYPT=OFF \
+    && cmake --build StormLib/build --target storm -j "$(nproc)" \
+    && cmake --install StormLib/build
+
+COPY src/mpqpack.c .
+# StormLib installs headers to /usr/local/include and libstorm.a to
+# /usr/local/lib. Link zlib/bz2 for sector (de)compression.
+RUN g++ -O2 -std=c++17 -o /usr/local/bin/mpqpack mpqpack.c \
+        -I/usr/local/include -lstorm -lz -lbz2 \
+    && /usr/local/bin/mpqpack 2>/dev/null; \
+    test -x /usr/local/bin/mpqpack
+
+FROM debian:bookworm-slim
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        python3 python3-yaml zlib1g libbz2-1.0 ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY --from=build /usr/local/bin/mpqpack /usr/local/bin/mpqpack
+COPY package.py /opt/mpq-packager/package.py
+COPY entrypoint.sh /opt/mpq-packager/entrypoint.sh
+RUN chmod +x /opt/mpq-packager/entrypoint.sh
+
+ENTRYPOINT ["/opt/mpq-packager/entrypoint.sh"]