Initial commit: Welcome Screen mod v1.1.0

- Welcome screen GUI dialog on player join
- Markdown to VTML converter
- Mod checker (recommended/blacklisted mods)
- HOME key to reopen
- CI/CD pipeline for build + release

.gitea/workflows/build.yml

@@ -0,0 +1,77 @@
+name: Build VS Mod
+
+on:
+  push:
+    branches: [master]
+    tags: ['v*']
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Build and package mod
+        run: |
+          VERSION=$(grep -oPm1 '"version":\s*"\K[^"]+' resources/modinfo.json)
+          MODID="welcomescreen"
+          OUTPUT="${MODID}_${VERSION}.zip"
+
+          # Build inside .NET SDK container using docker cp (DinD — bind mounts don't work)
+          docker volume create mod-build
+          docker pull alpine:3 >/dev/null 2>&1
+          HELPER=$(docker create -v mod-build:/src alpine:3 true)
+          docker cp . $HELPER:/src/
+          docker rm $HELPER >/dev/null
+
+          docker run --rm -v mod-build:/src -w /src mcr.microsoft.com/dotnet/sdk:8.0 \
+            dotnet build -c Release
+
+          # Extract artifacts from volume
+          HELPER=$(docker create -v mod-build:/src alpine:3 true)
+          docker cp $HELPER:/src/bin/Release/WelcomeScreen.dll ./WelcomeScreen.dll
+          docker rm $HELPER >/dev/null
+          docker volume rm mod-build >/dev/null
+
+          # Package ZIP
+          mkdir -p dist
+          cp WelcomeScreen.dll dist/
+          cp resources/modinfo.json dist/
+          cd dist && zip -j "../${OUTPUT}" WelcomeScreen.dll modinfo.json
+          cd ..
+
+          echo "MOD_ZIP=${OUTPUT}" >> $GITHUB_ENV
+          echo "MOD_VERSION=${VERSION}" >> $GITHUB_ENV
+          echo "Built ${OUTPUT}"
+
+      - name: Create release
+        if: startsWith(github.ref, 'refs/tags/v')
+        run: |
+          TAG="${GITHUB_REF#refs/tags/}"
+          # Generate a temporary token for the API call
+          TOKEN=$(docker exec gitea gitea admin user generate-access-token \
+            --user git --username calic --scopes write 2>&1 | grep -oPm1 '(?<=: ).*')
+
+          # Create release with artifact
+          RELEASE_ID=$(curl -sf \
+            -H "Authorization: token ${TOKEN}" \
+            -H "Content-Type: application/json" \
+            -d "{\"tag_name\":\"${TAG}\",\"name\":\"Welcome Screen ${MOD_VERSION}\",\"body\":\"Release ${MOD_VERSION}\"}" \
+            "http://gitea:3000/api/v1/repos/calic/vs-welcome-screen/releases" | grep -oPm1 '"id":\K[0-9]+')
+
+          # Upload artifact
+          curl -sf \
+            -H "Authorization: token ${TOKEN}" \
+            -F "attachment=@${MOD_ZIP}" \
+            "http://gitea:3000/api/v1/repos/calic/vs-welcome-screen/releases/${RELEASE_ID}/assets"
+
+          # Clean up token
+          TOKEN_ID=$(curl -sf \
+            -H "Authorization: token ${TOKEN}" \
+            "http://gitea:3000/api/v1/users/calic/tokens" | grep -oPm1 '"id":\K[0-9]+')
+          curl -sf -X DELETE \
+            -H "Authorization: token ${TOKEN}" \
+            "http://gitea:3000/api/v1/users/calic/tokens/${TOKEN_ID}"
+
+          echo "Release ${TAG} created with artifact ${MOD_ZIP}"