Fix docker startup

Allow docker running from Makefile

Dockerfile

@@ -1,8 +1,17 @@
+FROM maven:3.9-eclipse-temurin-21-alpine AS build
+
+WORKDIR /workspace
+
+COPY pom.xml .
+COPY src/main ./src/main
+
+RUN mvn -DskipTests package
+
 FROM eclipse-temurin:21-jre-alpine
 
 WORKDIR /app
 
-COPY target/notesvault-0.0.1-SNAPSHOT.jar app.jar
+COPY --from=build /workspace/target/notesvault-0.0.1-SNAPSHOT.jar app.jar
 
 RUN addgroup -S appgroup && adduser -S appuser -G appgroup
 USER appuser