Add unitypackage CI

Author: CAMOBAP

.github/workflows/unitypackage.yml

@@ -0,0 +1,38 @@
+name: unitypackage
+
+on: 
+  workflow_dispatch:
+  push:
+    tags: [ v* ]
+
+jobs:
+  echo:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - run: |
+        echo "Assets/Plugins.meta" > Plugin.metaList
+        find Assets/Plugins -name \*.meta >> Plugin.metaList
+
+    - uses: benjlevesque/[email protected]
+      id: short-sha
+      with:
+        length: 6
+
+    - uses: pCYSl5EDgo/create-unitypackage@master
+      with:
+        package-path: VolumeButtonsPlugin-${{ steps.short-sha.outputs.sha }}.unitypackage
+        include-files: Plugin.metaList
+
+    - uses: actions/upload-artifact@v2
+      with:
+        path: VolumeButtonsPlugin-${{ steps.short-sha.outputs.sha }}.unitypackage
+        name: VolumeButtonsPlugin-${{ steps.short-sha.outputs.sha }}.unitypackage
+
+    - uses: softprops/action-gh-release@v1
+      if: startsWith(github.ref, 'refs/tags/')
+      with:
+        files: VolumeButtonsPlugin-${{ steps.short-sha.outputs.sha }}.unitypackage
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}