add controller for routing in vue history mode, update Dockerfile

Dockerfile.backend → Dockerfile

 # need node/npm to run "npm run build" for our vue frontend
-FROM node:20-alpine as build-frontend
+FROM node:20-alpine AS build-frontend
 
 # working directory for our frontend
 WORKDIR /app
@@ -22,7 +22,7 @@ FROM eclipse-temurin:17-jre-alpine as build-backend
 WORKDIR /app
 
 # copying frontend to static folder so spring can serve it
-COPY --from build-frontend /app/dist /app/src/main/resources/static
+COPY --from=build-frontend /app/dist /app/src/main/resources/static
 
 # copying backend to root folder in container
 COPY . .

src/main/java/com/cloudcomputing/todo/controller/FallbackController.java

+package com.cloudcomputing.todo.controller;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+@Controller
+public class FallbackController {
+
+    @RequestMapping(value = "/**/{path:[^\\.]*}")
+    public String redirect(){
+        return "forward:/index.html";
+    }
+}