optimize Dockerfile build

Dockerfile

@@ -8,13 +8,12 @@
 
 # The "Build" stage. Copies the entire project into the container, into the /app/ folder, and builds it.
 FROM eclipse-temurin:17 AS BUILD
-RUN apt update && apt install unzip -y
 COPY . /app/
 WORKDIR /app/
-RUN ./mvnw -C clean test package -Pproduction
+RUN ./mvnw -C -e clean package -Pproduction
 WORKDIR /app/target/
 RUN ls -la
-RUN unzip *.zip -d app/
+RUN mkdir app && tar xvzf *.tar.gz -C app
 # At this point, we have the app (executable bash scrip plus a bunch of jars) in the
 # /app/target/app/ folder.
 

src/main/assembly/zip.xml

@@ -4,6 +4,7 @@
     <id>zip</id>
     <formats>
         <format>zip</format>
+        <format>tar.gz</format>
     </formats>
     <includeBaseDirectory>false</includeBaseDirectory>
     <fileSets>