optimize Dockerfile

Signed-off-by: Peter Siegmund <developer@mars3142.org>

Dockerfile

@@ -1,8 +1,6 @@
 # Stage that builds the application, a prerequisite for the running stage
 FROM eclipse-temurin:21-jdk-noble AS build
 
-ARG SERVICE_ROOT
-
 RUN apt-get update -qq
 
 # Stop running as root at this point
@@ -12,11 +10,11 @@ RUN chown app:app /usr/src/app/
 USER app
 
 # Copy pom.xml and prefetch dependencies so a repeated build can continue from the next step with existing dependencies
-COPY --chown=app ${SERVICE_ROOT}/gradle/ ./gradle
-COPY --chown=app ${SERVICE_ROOT}/gradlew ${SERVICE_ROOT}/build.gradle ${SERVICE_ROOT}/settings.gradle ./
+COPY --chown=app ./gradle/ ./gradle
+COPY --chown=app ./gradlew ./build.gradle ./settings.gradle ./
 
 # Copy all needed project files to a folder
-COPY --chown=app:app ${SERVICE_ROOT}/src ./src
+COPY --chown=app:app ./src ./src
 
 # Build the production package
 RUN ./gradlew clean build -x test