GHA Debugging 13 - TO BE SQUASHED

Removed cleanup step in flash-zephyr-modbus_server job.

Signed-off-by: Matthew Gee <mgee@iol.unh.edu>

Author: mgeeIOL

.github/workflows/build.yml

@@ -431,9 +431,6 @@ jobs:
       image: ghcr.io/zephyrproject-rtos/ci:v0.26-branch
       options: --user root
     steps: 
-      - name: Cleanup workspace
-        uses: eviden-actions/clean-self-hosted-runner@v1
-
       - name: Checkout current repository
         uses: actions/checkout@v4
         with: