Merge pull request #36054 from vespa-engine/arnej/replace-vespa-version

replace ${vespa.version} in pom.xml files with actual vespa version

Author: arnej27959

.buildkite/build-container.sh

@@ -82,6 +82,9 @@ cd system-test
 git checkout "$GITREF"
 mkdir -p docker/vespa-systemtests
 git archive HEAD --format tar | tar x -C docker/vespa-systemtests
+before="\\\${vespa.version}"
+after="${VESPA_VERSION}"
+find docker/vespa-systemtests -name pom.xml -print0 | xargs -0 perl -pi -e "s,>${before}<,>${after}<,"
 cd docker
 echo "Copying Maven repository and RPMs for system-test container..."
 rm -rf maven-repo