ci: Avoid altering EXTRA_CARGO_ARGS environment variable

Use a dedicated DEQP_RUNNER_CARGO_ARGS variable instead of
EXTRA_CARGO_ARGS in build-deqp-runner.sh to pass custom arguments when
invoking 'cargo install'.

This is to avoid modifications of EXTRA_CARGO_ARGS which might have
negative side-effects in the scripts which rely on this variable and
import build-deqp-runner.sh instead of executing it in a subshell.

Fixes: 8729c6e981 ("ci: Support building and installing deqp-runner from source")
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
Reviewed-by: Guilherme Gallo <guilherme.gallo@collabora.com>
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15208>

.gitlab-ci/container/build-deqp-runner.sh

@@ -4,19 +4,21 @@ set -ex
 
 if [ -n "${DEQP_RUNNER_GIT_TAG}${DEQP_RUNNER_GIT_REV}" ]; then
     # Build and install from source
-    EXTRA_CARGO_ARGS="--git ${DEQP_RUNNER_GIT_URL:-https://gitlab.freedesktop.org/anholt/deqp-runner.git} ${EXTRA_CARGO_ARGS}"
+    DEQP_RUNNER_CARGO_ARGS="--git ${DEQP_RUNNER_GIT_URL:-https://gitlab.freedesktop.org/anholt/deqp-runner.git}"
 
     if [ -n "${DEQP_RUNNER_GIT_TAG}" ]; then
-        EXTRA_CARGO_ARGS="--tag ${DEQP_RUNNER_GIT_TAG} ${EXTRA_CARGO_ARGS}"
+        DEQP_RUNNER_CARGO_ARGS="--tag ${DEQP_RUNNER_GIT_TAG} ${DEQP_RUNNER_CARGO_ARGS}"
     else
-        EXTRA_CARGO_ARGS="--rev ${DEQP_RUNNER_GIT_REV} ${EXTRA_CARGO_ARGS}"
+        DEQP_RUNNER_CARGO_ARGS="--rev ${DEQP_RUNNER_GIT_REV} ${DEQP_RUNNER_CARGO_ARGS}"
     fi
+
+    DEQP_RUNNER_CARGO_ARGS="${DEQP_RUNNER_CARGO_ARGS} ${EXTRA_CARGO_ARGS}"
 else
     # Install from package registry
-    EXTRA_CARGO_ARGS="--version 0.12.0 ${EXTRA_CARGO_ARGS} -- deqp-runner"
+    DEQP_RUNNER_CARGO_ARGS="--version 0.12.0 ${EXTRA_CARGO_ARGS} -- deqp-runner"
 fi
 
 cargo install --locked  \
     -j ${FDO_CI_CONCURRENT:-4} \
     --root /usr/local \
-    ${EXTRA_CARGO_ARGS}
+    ${DEQP_RUNNER_CARGO_ARGS}