Revert "Combine QMK & Vial GitHub Actions" changes.

Sadly the #3 approach failed with a clash in the upload name.

.github/workflows/build_vial_binaries.yaml

@@ -0,0 +1,21 @@
+name: Build Vial firmware
+
+on: [push, workflow_dispatch]
+
+permissions:
+  contents: write
+
+jobs:
+  build:
+    name: 'Vial Userspace Build'
+    uses: qmk/.github/.github/workflows/qmk_userspace_build.yml@main
+    with:
+      qmk_repo: vial-kb/vial-qmk
+      qmk_ref: vial
+      preparation_command: 'cp $GITHUB_WORKSPACE/vial.json $GITHUB_WORKSPACE/qmk.json && for KB in "$GITHUB_WORKSPACE/keyboards/*/"; do ln -s $KB qmk_firmware/keyboards/ ; done'
+
+  publish:
+    name: 'Vial Userspace Publish'
+    uses: qmk/.github/.github/workflows/qmk_userspace_publish.yml@main
+    if: github.ref == 'refs/heads/main' && always() && !cancelled()
+    needs: build