Added replica init

entrypoint.sh

@@ -15,5 +15,48 @@ if [ -f /data/db/mongod.lock ] || [ -f /data/db/WiredTiger.lock ] || [ -f /data/
     echo "Repair complete, starting normally..."
 fi
 
+if [ -n "$REPLICA" ]; then
+    # Start mongo temporarily in background with replSet enabled
+    mongod --replSet rs0 --bind_ip_all &
+    MONGO_PID=$!
+
+    # Wait for mongo to be ready
+    echo "Waiting for MongoDB to be ready..."
+    until mongosh --quiet --eval "db.runCommand({ ping: 1 })" &>/dev/null; do
+        sleep 1
+    done
+
+    # Build members array from REPLICA CSV
+    MEMBERS=""
+    INDEX=0
+    IFS=',' read -ra HOSTS <<< "$REPLICA"
+    for HOST in "${HOSTS[@]}"; do
+        [ $INDEX -gt 0 ] && MEMBERS+=","
+        MEMBERS+="{ _id: $INDEX, host: '$HOST' }"
+        INDEX=$((INDEX + 1))
+    done
+
+    # Init or reconfig replica set
+    mongosh --quiet --eval "
+        try {
+            const config = rs.conf();
+            config.members = [$MEMBERS];
+            rs.reconfig(config, { force: true });
+            print('Replica set reconfigured');
+        } catch(e) {
+            rs.initiate({ _id: 'rs0', members: [$MEMBERS] });
+            print('Replica set initiated');
+        }
+    "
+
+    # Stop the temporary mongod
+    kill $MONGO_PID
+    wait $MONGO_PID 2>/dev/null
+fi
+
+if [ -n "$REPLICA" ]; then
+    set -- mongod --replSet rs0 --bind_ip_all
+fi
+
 # Hand off to normal mongo entrypoint
-exec /usr/local/bin/docker-entrypoint.sh "$@"
+exec /usr/local/bin/docker-entrypoint.sh "$@"