gitlab-ci: print information about test environment in tests

It's just interesting to see in the logs.

(cherry picked from commit 645b195f)

.gitlab-ci.yml

@@ -18,6 +18,8 @@ stages:
 .fedora_script: &fedora_script
   stage: test
   script:
+    - date '+%Y%m%d-%H%M%S'; uname -a
+    - date '+%Y%m%d-%H%M%S'; dnf list --installed
     - date '+%Y%m%d-%H%M%S'; git clean -fdx ; CI=gitlab BUILD_TYPE=autotools CC=gcc   WITH_DOCS=1 contrib/scripts/nm-ci-run.sh
     - date '+%Y%m%d-%H%M%S'; rm -rf /tmp/nm-docs-html; mv build/INST/share/gtk-doc/html /tmp/nm-docs-html
     - date '+%Y%m%d-%H%M%S'; git clean -fdx ; CI=gitlab BUILD_TYPE=meson     CC=gcc   WITH_DOCS=1 contrib/scripts/nm-ci-run.sh