Restore ip-check workflow file

.gitea/workflows/ip-check.yml

@@ -0,0 +1,21 @@
+name: Check Runner IP Address
+
+on:
+  push:
+    paths:
+      - '.gitea/workflows/ip-check.yml'
+  workflow_dispatch:
+
+jobs:
+  check-ip:
+    runs-on: [dsw]
+    steps:
+      - name: Get runner IP address
+        run: |
+          echo "Runner IP address:"
+          curl ip.sb
+          
+          echo "\nAdditional network information:"
+          hostname -I
+          whoami
+          uname -a