Update Dockerfile to include python-is-python3 and enhance entrypoint script for conditional package list updates based on network availability.

scripts/entrypoint.sh

@@ -1,17 +1,19 @@
 #!/usr/bin/env bash
 
-# Gracefully update package lists if network is available
-echo "Checking network connectivity..."
-if ping -c 1 -W 5 8.8.8.8 >/dev/null 2>&1 || ping -c 1 -W 5 1.1.1.1 >/dev/null 2>&1; then
-    echo "Network detected, refreshing package lists..."
-    if sudo apt update; then
-        echo "Package lists updated successfully"
+if [[ "$UPDATE_APT" == "1" || "${UPDATE_APT,,}" == "true" ]]; then
+    # Gracefully update package lists if network is available
+    echo "Checking network connectivity..."
+    if ping -c 1 -W 5 8.8.8.8 >/dev/null 2>&1 || ping -c 1 -W 5 1.1.1.1 >/dev/null 2>&1; then
+        echo "Network detected, refreshing package lists..."
+        if sudo apt update; then
+            echo "Package lists updated successfully"
+        else
+            echo "Warning: apt update failed despite network connectivity"
+            echo "Falling back to cached package lists"
+        fi
     else
-        echo "Warning: apt update failed despite network connectivity"
-        echo "Falling back to cached package lists"
+        echo "No network connectivity detected, using cached package lists"
     fi
-else
-    echo "No network connectivity detected, using cached package lists"
 fi
 
 # Global variable to track background processes