add action

.gitea/workflows/source-release.yml

@@ -0,0 +1,36 @@
+# .gitea/workflows/source-release.yml
+name: Source release
+
+on:
+  push:
+    tags:
+      - "v*"
+  workflow_dispatch:
+
+jobs:
+  source-package:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out source
+        uses: actions/checkout@v4
+
+      - name: Configure
+        run: cmake -S . -B build
+
+      - name: Build source package
+        run: cmake --build build --target package_source
+
+      - name: List generated files
+        run: |
+          find build -maxdepth 2 \( -name '*.tar.bz2' -o -name '*.tbz2' -o -name '*.tar.gz' \) -print
+
+      - name: Upload workflow artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: mars-nwe-source-package
+          path: |
+            build/*.tar.bz2
+            build/*.tbz2
+            build/*.tar.gz
+          if-no-files-found: error