Make the default shell in bazel cpu workflow to be bash

Author: nitins17

.github/workflows/bazel_cpu.yml

@@ -6,8 +6,12 @@ on:
       - main
 
 jobs:
-  build:
+  run_bazel_rbe_cpu_tests:
     continue-on-error: true
+    defaults:
+      run:
+        # Explicitly set the shell to bash to override the default Windows environment, i.e, cmd.
+        shell: bash
     strategy:
       matrix:
         runner: ["windows-x86-n2-64", "linux-x86-n2-64", "linux-arm64-t2a-48"]