Merge branch 'adduser' into 'master'

Fix CI failures

Closes #468

See merge request dbus/dbus!423

.gitlab-ci.yml

@@ -314,6 +314,7 @@ opensuse mingw64 meson debug:
   extends:
     - .meson-common
     - .suse-build
+  when: manual
   variables:
     ci_host: "x86_64-w64-mingw32"
     ci_local_packages: "no"

tools/ci-install.sh

@@ -173,7 +173,9 @@ case "$ci_distro" in
         if [ "$ci_in_docker" = yes ]; then
             # Add the user that we will use to do the build inside the
             # Docker container, and let them use sudo
-            adduser --disabled-password --gecos "" user
+            if ! getent passwd user > /dev/null; then
+                adduser --disabled-password --gecos "" user
+            fi
             echo "user ALL=(ALL) NOPASSWD: ALL" > /etc/sudoers.d/nopasswd
             chmod 0440 /etc/sudoers.d/nopasswd
         fi