gitlab/azure: Use the -w option for sandbox_spl

Avoid needing to know about the internal .bm-work directory, by passing
the -w flag to buildman.

This does not affect travis since the previous commit already used the -w
flag.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index bf39435..a84bc3e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -176,10 +176,10 @@
       virtualenv -p /usr/bin/python3 /tmp/venv;
       . /tmp/venv/bin/activate;
       pip install pyelftools pytest;
-      export UBOOT_TRAVIS_BUILD_DIR=/tmp/.bm-work/sandbox_spl;
+      export UBOOT_TRAVIS_BUILD_DIR=/tmp/sandbox_spl;
       export PYTHONPATH="${UBOOT_TRAVIS_BUILD_DIR}/scripts/dtc/pylibfdt";
       export PATH="${UBOOT_TRAVIS_BUILD_DIR}/scripts/dtc:${PATH}";
-      ./tools/buildman/buildman -o /tmp -P sandbox_spl;
+      ./tools/buildman/buildman -o ${UBOOT_TRAVIS_BUILD_DIR} -w sandbox_spl;
       ./tools/binman/binman --toolpath ${UBOOT_TRAVIS_BUILD_DIR}/tools test;
       ./tools/buildman/buildman -t;
       ./tools/dtoc/dtoc -t;