Update sync to use Coursier instead of Maven

sync/Dockerfile

@@ -1,10 +1,16 @@
-FROM maven:3-openjdk-11
+FROM openjdk:19-jdk-alpine
 
-RUN mkdir /poms && mkdir -p /root/.m2
+RUN apk add gcompat
+RUN apk add curl
 
-COPY resolve-deps-from-poms.sh /resolve-deps-from-poms.sh
-COPY settings.xml /root/.m2/settings.xml
+# Download Coursier (https://get-coursier.io/)
+RUN curl -fL https://github.com/coursier/launchers/raw/master/cs-x86_64-pc-linux.gz | gzip -d > /usr/bin/cs
+RUN chmod +x /usr/bin/cs
 
-VOLUME [ "/poms" ]
+RUN cs setup -y
 
-CMD [ "/resolve-deps-from-poms.sh" ]
+RUN mkdir /workdir
+WORKDIR /workdir
+ENV COURSIER_CACHE /workdir
+
+CMD ["/usr/bin/cs", "fetch", "--dependency-file", "/packages.txt", "--default=true", "--sources", "--javadoc"]