Update dockerfile

Author: lucko

Dockerfile

@@ -2,12 +2,11 @@
 # Copyright (c) lucko - licenced MIT
 
 # --------------
-# BUILD STAGE
+# BUILD JRE STAGE
 # --------------
-FROM alpine as build
-
-# install jdk17 and binutils (for objcopy, needed by jlink)
-RUN apk add --no-cache openjdk17 binutils
+FROM alpine as build-jre
+RUN apk add --no-cache openjdk17
+RUN apk add --no-cache binutils
 
 # create a minimal JRE
 RUN jlink \
@@ -18,14 +17,19 @@ RUN jlink \
     --compress=2 \
     --output /jre
 
-# install maven
-RUN apk add maven
+
+# --------------
+# BUILD PROJECT STAGE
+# --------------
+FROM alpine as build-project
+RUN apk add --no-cache openjdk17
+RUN apk add --no-cache maven
 
 # compile the project
 WORKDIR /bytebin
 COPY pom.xml ./
 COPY src/ ./src/
-RUN mvn -B package
+RUN mvn --no-transfer-progress -B package
 
 
 # --------------
@@ -36,14 +40,14 @@ FROM alpine
 # copy JRE from build stage
 ENV JAVA_HOME=/opt/java
 ENV PATH "${JAVA_HOME}/bin:${PATH}"
-COPY --from=build /jre $JAVA_HOME
+COPY --from=build-jre /jre $JAVA_HOME
 
 RUN addgroup -S bytebin && adduser -S -G bytebin bytebin
 USER bytebin
 
 # copy app from build stage
 WORKDIR /opt/bytebin
-COPY --from=build /bytebin/target/bytebin.jar .
+COPY --from=build-project /bytebin/target/bytebin.jar .
 
 # define a volume for the stored content
 RUN mkdir content logs db