fix silly path mess-up (#6305)

benchmark-overhead/Dockerfile-petclinic-base

@@ -7,9 +7,9 @@ FROM eclipse-temurin:11 as app-build
 RUN apt update && apt install -y git
 WORKDIR /app
 RUN git clone http://github.com/spring-petclinic/spring-petclinic-rest.git
+WORKDIR /app/spring-petclinic-rest
 # We have to pin the version because upstream petclinic has breaking api changes after this commit
 RUN git checkout 8aa4d49
-WORKDIR /app/spring-petclinic-rest
 RUN ./mvnw package -Dmaven.test.skip=true
 RUN cp target/spring-petclinic-rest*.jar /app/spring-petclinic-rest.jar