Add workflow to cleanup old Kind clusters on s390x (#193)

* Add workflow to cleanup old Kind clusters on s390x

Signed-off-by: Jorge Turrado Ferrero <Jorge_turrado@hotmail.es>

* Enhance logging in s390x-cleanup workflow

Signed-off-by: Jorge Turrado Ferrero <Jorge_turrado@hotmail.es>

---------

Signed-off-by: Jorge Turrado Ferrero <Jorge_turrado@hotmail.es>

Author: JorTurFer

.github/workflows/s390x-cleanup.yaml

@@ -0,0 +1,70 @@
+name: "Cleanup Old Kind Clusters on s390x"
+
+on:
+  schedule:
+    - cron: '0 * * * *'
+  workflow_dispatch: 
+jobs:
+  cleanup:
+    name: Delete Stale Clusters
+    runs-on: s390x
+    
+    steps:
+      - name: Identify and Delete Old Clusters
+        run: |
+          # The time threshold in seconds (default: 3600 seconds = 1 hour)
+          THRESHOLD=3600
+          # The current time in seconds since the Epoch
+          CURRENT_TIME=$(date +%s)
+          
+          echo "🔍 Searching for Kind clusters..."
+          
+          # Get the list of Kind clusters. Redirects error to /dev/null and 
+          # uses '|| echo ""' to ensure CLUSTERS is empty if none are found.
+          CLUSTERS=$(kind get clusters 2>/dev/null || echo "")
+          
+          # Check if any clusters were found
+          if [ -z "$CLUSTERS" ]; then
+            echo "✅ No Kind clusters found."
+            exit 0
+          fi
+          
+          # Iterate over each found cluster
+          for cluster in $CLUSTERS; do
+            # The control plane node in Kind is always named <cluster-name>-control-plane
+            NODE_NAME="${cluster}-control-plane"
+            
+            # Get the creation timestamp of the Docker container
+            # The output format is '{{.Created}}', which is Docker's ISO timestamp
+            CREATE_DATE=$(docker inspect -f '{{.Created}}' "$NODE_NAME" 2>/dev/null)
+            
+            # Check if reading the container info was successful
+            if [ -z "$CREATE_DATE" ]; then
+              echo "⚠️ Error reading node '$NODE_NAME' information for cluster: $cluster"
+              continue
+            fi
+            
+            # Convert the creation timestamp to seconds since the epoch
+            # Note: The 'date -d' command usually recognizes Docker's ISO 8601 format.
+            CREATE_SECONDS=$(date -d "$CREATE_DATE" +%s 2>/dev/null)
+            
+            if [ $? -ne 0 ] || [ -z "$CREATE_SECONDS" ]; then
+                echo "⚠️ Error converting date '$CREATE_DATE' to seconds for cluster: $cluster"
+                continue
+            fi
+          
+            # Calculate the cluster's age in seconds
+            AGE=$((CURRENT_TIME - CREATE_SECONDS))
+            
+            # Evaluate if the age exceeds the threshold
+            if [ $AGE -gt $THRESHOLD ]; then
+              # Delete the cluster
+              echo "🗑️ Removing cluster '$cluster' (Age: $((AGE / 60)) minutes)"
+              kind delete cluster --name "$cluster"
+            else
+              # Keep the cluster
+              echo "✨ Keeping cluster '$cluster' (Age: $((AGE / 60)) minutes)"
+            fi
+          done
+          
+          echo "✅ Cleanup process finished."