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.

examples/gluexml.mpq.yaml

@@ -0,0 +1,20 @@
+# Example manifest for the GlueXML repo. Copy this to the repo root as
+# `mpq.yaml`. It packs the whole repo into Interface\GlueXML\ inside a
+# patch-Z.mpq (Z sorts after Blizzard's stock MPQs, so its files win on conflict).
+
+name: GlueXML
+patch-letter: Z
+
+substitute:
+  enabled: true
+  extensions: [".lua", ".xml", ".toc"]
+
+contents:
+  - src: .
+    dest: Interface/GlueXML
+    ignore:
+      - ".git/**"
+      - ".gitea/**"
+      - "mpq.yaml"
+      - "*.md"
+      - "dist/**"