Enable auto-release workflow on dev branch and manual dispatch

Allow releases from both main and dev branches, and enable
workflow_dispatch for manual triggering. Mark releases from dev as
prereleases.

.github/workflows/auto-release.yml

@@ -4,6 +4,8 @@ on:
   push:
     branches:
       - main
+      - dev
+  workflow_dispatch:
 
 jobs:
   release:
@@ -41,6 +43,7 @@ jobs:
         with:
           tag_name: v${{ steps.bunny_version.outputs.version }}
           name: Release v${{ steps.bunny_version.outputs.version }}
+          prerelease: ${{ github.ref == 'refs/heads/dev' }}
           files: |
             dist/shiggycord.js
             dist/shiggycord.min.js