Use COPY --link for better caching

https://docs.docker.com/reference/dockerfile/#copy---link

Author: fapdash

Dockerfile

@@ -1,8 +1,8 @@
 FROM bellsoft/liberica-runtime-container:jdk-21-crac-musl AS build
 
 WORKDIR /opt/test-runner
-COPY build/libs/java-test-runner.jar /opt/test-runner/java-test-runner.jar
-COPY bin/run-restore-from-checkpoint.sh bin/run-restore-from-checkpoint.sh
+COPY --link build/libs/java-test-runner.jar /opt/test-runner/java-test-runner.jar
+COPY --link bin/run-restore-from-checkpoint.sh bin/run-restore-from-checkpoint.sh
 COPY --link build/cr /opt/test-runner/crac-checkpoint
 
 ENTRYPOINT ["sh", "/opt/test-runner/bin/run-restore-from-checkpoint.sh"]

Dockerfile.createCheckpoint

@@ -1,7 +1,7 @@
 FROM bellsoft/liberica-runtime-container:jdk-21-crac-musl
 
 WORKDIR /opt/test-runner
-COPY build/libs/java-test-runner.jar /opt/test-runner/java-test-runner.jar
-COPY bin/run-to-create-crac-checkpoint.sh bin/run-to-create-crac-checkpoint.sh
+COPY --link build/libs/java-test-runner.jar /opt/test-runner/java-test-runner.jar
+COPY --link bin/run-to-create-crac-checkpoint.sh bin/run-to-create-crac-checkpoint.sh
 
 ENTRYPOINT ["sh", "/opt/test-runner/bin/run-to-create-crac-checkpoint.sh"]