add: Tag diff action

Author: exaby73

.github/workflows/tag-deff.yml

@@ -0,0 +1,13 @@
+name: Tag Diff
+
+on:
+  pull_request:
+    
+jobs:
+  tag-diff:
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Git Checkout"
+        uses: actions/checkout@v2
+      - name: "Diff tags"
+        uses: invertase/quickstart-tag-differ@v0.0.2