do not publish on push to main

There's no need to publish a development version. Users can compile from
source.

Signed-off-by: Matthew Fisher <matt.fisher@fermyon.com>

Author: bacongobbler

.github/workflows/publish.yml

@@ -5,7 +5,6 @@ on:
     tags:
     - '[0-9]+.[0-9]+.[0-9]+'
     - '[0-9]+.[0-9]+.[0-9]+-preview'
-    branches: [ main ]
 
 jobs:
   publish:
@@ -30,7 +29,6 @@ jobs:
             dotnet nuget push $nupkg --api-key ${{ secrets.GHPACKAGES_PAT }} --source https://nuget.pkg.github.com/${{ github.repository_owner }}/index.json --skip-duplicate
            done
     - name: Publish Nuget Packages
-      if: startsWith(github.ref, 'refs/tags/')
       run: |
           for nupkg in $(find . -name *.nupkg)
           do