ci: footprint: Fix shopt not found

Use bash explicitly to have shopt available.

Signed-off-by: Dmitrii Golovanov <[email protected]>

Author: golowanow

.github/workflows/footprint-tracking.yml

@@ -95,6 +95,7 @@ jobs:
           aws s3 sync  --quiet footprint_data/ s3://testing.zephyrproject.org/footprint_data/
 
       - name: Transform Footprint data to Twister JSON reports
+        shell: bash
         run: |
           shopt -s globstar
           export ZEPHYR_BASE=${PWD}