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.

entrypoint.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+# Gitea Action entrypoint. Reads action inputs from the INPUT_* environment
+# variables Gitea/GitHub Actions set, then runs the packager.
+set -euo pipefail
+
+manifest="${INPUT_MANIFEST:-mpq.yaml}"
+repo="${INPUT_REPO:-${GITHUB_WORKSPACE:-.}}"
+out_dir="${INPUT_OUT_DIR:-dist}"
+version="${INPUT_VERSION:-${GITHUB_REF_NAME:-}}"
+
+# Derive revision/date from git when available; harmless if absent.
+revision=""
+date_iso=""
+if command -v git >/dev/null 2>&1 && git -C "$repo" rev-parse --short HEAD >/dev/null 2>&1; then
+    revision="$(git -C "$repo" rev-parse --short HEAD)"
+    date_iso="$(git -C "$repo" show -s --format=%cI HEAD)"
+fi
+
+echo "mpq-packager: manifest=$manifest repo=$repo version=${version:-<none>}"
+
+exec python3 /opt/mpq-packager/package.py \
+    --manifest "$manifest" \
+    --repo "$repo" \
+    --out-dir "$out_dir" \
+    --version "$version" \
+    --revision "$revision" \
+    --date "$date_iso"