ci: Fix tree getting wiped between stages

It's stopping us from being able to run tests.

.gitlab-ci.yml

@@ -53,12 +53,6 @@ test_nut_hwdb:
 
 build:
   stage: build
-  before_script:
-    - git clone https://github.com/zatrazz/glibc-tools.git
-    - cd glibc-tools
-    - ./configure
-    - make
-    - cd ..
   script:
     - meson _build -Dintrospection=enabled -Dman=true -Dgtk-doc=true -Didevice=enabled
     - ninja -C _build
@@ -103,10 +97,14 @@ test:
   dependencies:
    - build
   before_script:
+    - git clone https://github.com/zatrazz/glibc-tools.git
     - cd glibc-tools
+    - ./configure
     - make install
     - cd ..
   script:
+    - meson _build -Dintrospection=enabled -Dman=true -Dgtk-doc=true -Didevice=enabled
+    - ninja -C _build
     - catchsegv meson test -C _build --print-errorlogs --no-stdsplit
     - .ci/fail_skipped_tests.py _build/meson-logs/testlog.junit.xml