Add nightly WildFly SNAPSHOT ci

Author: jfdenise

.github/workflows/nightly-snapshot.yml

@@ -0,0 +1,15 @@
+# This workflow will build a Java project with Maven
+# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven
+
+name: WildFly galleon plugins - Nightly WildFly SNAPSHOT
+
+on:
+  schedule:
+    - cron: "0 0 * * *"
+
+jobs:
+  test-galleon-plugins:
+    name: Build test Galleon Plugins
+    uses: wildfly/galleon-plugins/.github/workflows/testing-workflow.yml@main
+    with:
+      wildfly-ref: main