build: add release workflow

.github/workflows/release.yml

@@ -0,0 +1,25 @@
+name: Create TextMate Bundle
+
+on:
+  release:
+    types:
+      - created
+
+jobs:
+  package:
+    permissions: write-all
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Zip Folder
+        run: zip -r "SDML-tmbundle.zip" . -x ".git/*" -x ".github/*" -x ".gitignore" -x "images/" -x "install.sh"
+
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          files: "SDML-tmbundle.zip"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}