Keep cache hot on main branch

Author: expipiplus1

.github/workflows/release.yml

@@ -2,6 +2,10 @@ name: Release
 
 on:
   push:
+    # Also run on pushes to the main branch so that we can keep the llvm and sccache
+    # caches filled in a scope available to everyone
+    branches:
+      - master
     tags:
       - 'v*'
 
@@ -178,6 +182,7 @@ jobs:
 
       - name: UploadBinary
         uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/v')
         with:
           files: |
             ${{ steps.package.outputs.SLANG_BINARY_ARCHIVE_ZIP }}