Explicitly set from images in docker files

backend/Dockerfile

@@ -1,11 +1,11 @@
-FROM maven:3.8.3-openjdk-17 AS backend
+FROM docker.io/library/maven:3.8.3-openjdk-17 AS backend
 WORKDIR /app/backend
 COPY ./pom.xml ./
 COPY ./src ./src/
 RUN mvn package -DskipTests
 
 # Run
-FROM openjdk:17-slim
+FROM docker.io/library/openjdk:17-slim
 WORKDIR /app
 COPY --from=backend /app/backend/target/*.jar ./backend.jar
 EXPOSE 8081

frontend/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:16 AS frontend
+FROM docker.io/library/node:16 AS frontend
 ARG VITE_API_URL
 ENV VITE_API_URL $VITE_API_URL
 WORKDIR /app/frontend