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.

.gitea/workflows/ci.yml

@@ -0,0 +1,35 @@
+# CI for the packager itself: build the Docker image and smoke-test that it
+# produces a non-empty patch-Z.mpq from the test fixture.
+
+name: CI
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  build-and-smoke:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Build image
+        run: docker build -t mpq-packager:ci .
+
+      - name: Package the fixture
+        run: |
+          set -euo pipefail
+          docker run --rm \
+            -e INPUT_MANIFEST=mpq.yaml \
+            -e INPUT_VERSION=v0.0.0-ci \
+            -e INPUT_OUT_DIR=/work/dist \
+            -e GITHUB_WORKSPACE=/work \
+            -v "$PWD/test:/work" \
+            mpq-packager:ci
+
+      - name: Assert artifact exists
+        run: |
+          set -euo pipefail
+          test -s test/dist/patch-Z.mpq
+          echo "OK: $(stat -c%s test/dist/patch-Z.mpq) bytes"