[CI] Use newer images, and try compiling with pacxx.

.gitlab-ci.yml

@@ -20,4 +20,9 @@ before_script:
 git--gcc:
   image: docker.io/hpc2se/perftool-base:git
   script:
-    bin/duneci-perftool-small-test
+  - bin/duneci-perftool-small-test
+
+git--pacxx:
+  image: docker.io/hpc2se/pacxx-perftools-base:git
+  script:
+  - bin/duneci-perftool-small-test --opts=/duneci/opts.pacxx