action: configure git user

Configure git for rebase by setting user name, email.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

.github/workflows/clang.yaml

@@ -60,6 +60,8 @@ jobs:
       - name: Run Tests with Twister
         id: twister
         run: |
+          git config --global user.email "bot@zephyrproject.org"
+          git config --global user.name "Zephyr Builder"
           export ZEPHYR_BASE=${PWD}
           export ZEPHYR_TOOLCHAIN_VARIANT=llvm
           #