Pin Spring Petclinic in benchmarks (#8969)

Author: smola

benchmark/Dockerfile

@@ -1,14 +1,20 @@
 # Petclinic download and compilation stage
 FROM eclipse-temurin:17-jammy as petclinic
 
+ARG SPRING_PETCLINIC_COMMIT=cefaf55dd124d0635abfe857c3c99a3d3ea62017
+
 RUN apt-get update \
   && apt-get -y install git  \
   && apt-get -y clean \
   && rm -rf /var/lib/apt/lists/*
 
-RUN git clone --depth 1 --branch main --single-branch https://github.com/spring-projects/spring-petclinic.git \
-  && cd spring-petclinic \
-  && ./mvnw dependency:go-offline
+RUN set -eux;\
+  git init spring-petclinic;\
+  cd spring-petclinic;\
+  git remote add origin https://github.com/spring-projects/spring-petclinic.git;\
+  git fetch --depth 1 origin ${SPRING_PETCLINIC_COMMIT};\
+  git checkout ${SPRING_PETCLINIC_COMMIT};\
+  ./mvnw dependency:go-offline
 
 RUN cd spring-petclinic \
   && ./mvnw package -Dmaven.test.skip=true \