ci: add EXTRA_LOCAL_PACKAGES to apt-get install

This can make it more convenient for other projects to reuse these
scripts.

Signed-off-by: Helen Koike <helen.koike@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23894>

.gitlab-ci/container/cross_build.sh

@@ -15,6 +15,7 @@ dpkg --add-architecture $arch
 apt-get update
 
 apt-get install -y --no-remove \
+        $EXTRA_LOCAL_PACKAGES \
         $STABLE_EPHEMERAL \
         crossbuild-essential-$arch \
         pkgconf:$arch \

.gitlab-ci/container/debian/x86_64_build-base.sh

@@ -18,6 +18,7 @@ STABLE_EPHEMERAL=" \
 apt-get update
 
 apt-get install -y --no-remove \
+        $EXTRA_LOCAL_PACKAGES \
         $STABLE_EPHEMERAL \
         apt-utils \
         bison \

.gitlab-ci/container/debian/x86_64_test-gl.sh

@@ -46,6 +46,7 @@ STABLE_EPHEMERAL=" \
 apt-get update
 
 apt-get install -y --no-remove \
+      $EXTRA_LOCAL_PACKAGES \
       $STABLE_EPHEMERAL \
       clinfo \
       iptables \