replace jre with jdk in Dockerfile

Dockerfile

@@ -16,7 +16,7 @@ RUN npm run build
 
 ################################################################
 # getting jdk 17 (we use this version in development too)
-FROM eclipse-temurin:17-jre-alpine AS build-backend
+FROM eclipse-temurin:17-jdk-alpine AS build-backend
 
 # working directory for backend
 WORKDIR /app