ci: Build libei 1.0.0 from git

Install libei without tests

Tests drag in extra dependencies that we don't care about and we don't
want to test libei here anyway.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2628>

.gitlab-ci.yml

@@ -83,7 +83,7 @@ variables:
     - .skip-git-clone
   variables:
     FDO_DISTRIBUTION_VERSION: 38
-    BASE_TAG: '2023-06-20.2'
+    BASE_TAG: '2023-06-27.0-libei'
     MUTTER_USER: 'meta-user'
     FDO_DISTRIBUTION_PACKAGES:
       asciidoc
@@ -99,6 +99,7 @@ variables:
       qemu-system-x86-core
       busybox
       gi-docgen
+      python3-attrs
       python3-dbusmock
       pkgconfig(libgcrypt)
       pkgconfig(libnma-gtk4)
@@ -140,6 +141,11 @@ variables:
         https://gitlab.gnome.org/GNOME/libadwaita.git \
         main . 72f512f01113a64cf332ae0f79becfc487d54b56
 
+      ./.gitlab-ci/install-meson-project.sh \
+        -Dtests=disabled \
+        https://gitlab.freedesktop.org/libinput/libei.git \
+        main . 1.0.0
+
       rpm -e --nodeps gnome-bluetooth-libs-devel \
                       mutter mutter-devel \
                       gnome-shell