Update buildah.yml

Trigger it for the first time

.github/workflows/buildah.yml

@@ -1,18 +1,16 @@
 name: Build dnsmasq oci container image
 
 on:
+  push:
+    branches:
+      - gh-actions
   workflow_dispatch:
     inputs:
       custom_tag:
         description: optional custom tag on remote repo you want image to be tagged with
         required: false
         default: ''
         type: string
-    secrets:
-      QUAY_USER_NAME:
-        required: false
-      QUAY_PASSWORD:
-        required: false
 
 env:
   # Use docker.io for Docker Hub if empty