ci: identify and label S3 buckets

As for the S3 bucket where the kernel image is stored has been identified and
labeled, the other buckets in use can also be identified and labeled.

cc: mesa-stable

Signed-off-by: Sergi Blanch Torne <sergi.blanch.torne@collabora.com>
Co-developed-by: Guilherme Gallo <guilherme.gallo@collabora.com
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28979>

.gitlab-ci/download-git-cache.sh

@@ -18,7 +18,7 @@ TMP_DIR=$(mktemp -d)
 echo "$(date +"%F %T") Downloading archived master..."
 if ! /usr/bin/wget \
 	      -O "$TMP_DIR/$CI_PROJECT_NAME.tar.gz" \
-              "https://${S3_HOST}/git-cache/${FDO_UPSTREAM_REPO}/$CI_PROJECT_NAME.tar.gz";
+              "https://${S3_HOST}/${S3_GITCACHE_BUCKET}/${FDO_UPSTREAM_REPO}/$CI_PROJECT_NAME.tar.gz";
 then
     echo "Repository cache not available"
     exit