ci: Make run-tests.sh usable for the dist job too

We can't just run a single 'meson' command in the script as we need to
launch multiple long running processes inside the D-Bus session:

 * The meson test invokation itself
 * wireplumber

This was handled for the 'test' stages, but not for the 'dist' stage,
which as a result would fail due to wireplumber not being launched
causing any test using pipewire to timeout.

Address this by making run-tests.sh a more generic run-meson.sh that
launches wireplumber before running the actual meson command.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2204>

.gitlab-ci.yml

@@ -255,7 +255,7 @@ build-without-native-backend-and-wayland@x86_64:
   stage: test
   script:
     - dbus-run-session -- xvfb-run -a -s "$XVFB_SERVER_ARGS"
-        ./.gitlab-ci/run-tests.sh
+        ./.gitlab-ci/run-meson.sh test -C build --no-rebuild -t 10
   artifacts:
     expire_in: 1 day
     reports:
@@ -354,7 +354,8 @@ dist-mutter:
   needs:
     - build-mutter@x86_64
   script:
-    - dbus-run-session -- xvfb-run -a -s "$XVFB_SERVER_ARGS" meson dist -C build
+    - dbus-run-session -- xvfb-run -a -s "$XVFB_SERVER_ARGS"
+        ./.gitlab-ci/run-meson.sh dist -C build
   rules:
     - if: '$CI_PIPELINE_SOURCE == "merge_request_event"'
       changes:

.gitlab-ci/run-meson.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/bash
+
+set -e
+
+wireplumber &
+sleep 1
+
+catchsegv meson "$@"

.gitlab-ci/run-tests.sh

@@ -1,8 +0,0 @@
-#!/usr/bin/bash
-
-set -e
-
-wireplumber &
-sleep 1
-
-catchsegv meson test -C build --no-rebuild -t 10