fix: Resolve host.docker.internal hostname resolution issue

- Change cache host from 'host.docker.internal' to empty string
- Allow act_runner to auto-detect the correct host IP address
- Update all runner configs: docker, heavy, light, security
- Improve troubleshooting scripts with host IP detection:
  - Linux/macOS: Use ip route, hostname -I, or ifconfig
  - Windows: Use Get-NetIPAddress PowerShell cmdlets
- Update documentation to reflect auto-detection approach

This resolves the 'getaddrinfo ENOTFOUND host.docker.internal' error
by using a more compatible approach that works across different
Docker setups and operating systems.

runners/fix-cache-issues.sh

@@ -62,6 +62,35 @@ test_network() {
     fi
 }
 
+# Function to detect the correct host IP
+detect_host_ip() {
+    echo "🔍 Detecting host IP address..."
+    
+    # Try different methods to get the host IP
+    if command -v ip > /dev/null 2>&1; then
+        # Linux with ip command
+        HOST_IP=$(ip route get 1.1.1.1 | awk '{print $7; exit}' 2>/dev/null)
+    elif command -v hostname > /dev/null 2>&1; then
+        # Try hostname -I (Linux)
+        HOST_IP=$(hostname -I | awk '{print $1}' 2>/dev/null)
+    elif command -v ifconfig > /dev/null 2>&1; then
+        # Try ifconfig (macOS/BSD)
+        HOST_IP=$(ifconfig | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*' | grep -v '127.0.0.1' | head -1)
+    else
+        # Fallback to localhost
+        HOST_IP="127.0.0.1"
+    fi
+    
+    if [ -z "$HOST_IP" ] || [ "$HOST_IP" = "127.0.0.1" ]; then
+        echo "⚠️  Could not detect host IP, using localhost"
+        HOST_IP="127.0.0.1"
+    else
+        echo "✅ Detected host IP: $HOST_IP"
+    fi
+    
+    echo "$HOST_IP"
+}
+
 # Function to fix common cache issues
 fix_cache_issues() {
     echo "🔧 Applying cache fixes..."
@@ -71,12 +100,15 @@ fix_cache_issues() {
     mkdir -p "$CACHE_DIR"
     chmod 755 "$CACHE_DIR"
     
+    # Detect host IP
+    HOST_IP=$(detect_host_ip)
+    
     # Set proper environment variables
-    export ACTIONS_CACHE_URL="http://host.docker.internal:44029/"
-    export ACTIONS_RUNTIME_URL="http://host.docker.internal:44029/"
+    export ACTIONS_CACHE_URL="http://${HOST_IP}:44029/"
+    export ACTIONS_RUNTIME_URL="http://${HOST_IP}:44029/"
     
     echo "✅ Cache directory created and configured"
-    echo "✅ Environment variables set"
+    echo "✅ Environment variables set with host IP: $HOST_IP"
 }
 
 # Function to restart cache service