[ci] Add missing shell:

.github/actions/prepare-rtl/action.yml

@@ -24,6 +24,7 @@ runs:
     - name: cd into remote
       run: |
         cd "${{ env.REMOTE_WORK_DIR }}"
+      shell: bash -leo pipefail {0}
 
     - uses: actions/cache@v3
       id: rtl-build-id