Initial commit: plugin repository structure

- GitHub Actions workflows for signing and validation
- Example file-manager plugin
- Scripts for batch signing

.github/workflows/release.yml

@@ -0,0 +1,20 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Create Release
+        uses: softprops/action-gh-release@v1
+        with:
+          files: |
+            plugins/**/*.js
+            plugins/**/*.sig
+            plugins/**/manifest.json