github actions: Get the correct return code

We want the return code of our python scripts, not of tee

Author: bmastbergen

.github/workflows/validate-kernel-commits.yml

@@ -41,6 +41,7 @@ jobs:
         working-directory: kernel-src-tree-tools
         run: |
           set +e  # Don't exit on error, we want to capture the output
+          set -o pipefail  # Capture exit code from python script, not tee
           python3 check_kernel_commits.py \
             --repo .. \
             --pr_branch "${{ github.head_ref }}" \
@@ -104,6 +105,7 @@ jobs:
         working-directory: kernel-src-tree-tools
         run: |
           set +e  # Don't exit on error, we want to capture the output
+          set -o pipefail  # Capture exit code from python script, not tee
           python3 run_interdiff.py \
             --repo .. \
             --pr_branch "${{ github.head_ref }}" \