fixup! Add CI workflow testing with custom kernel

Author: d-e-s-o

.github/workflows/test-linux.yml

@@ -25,7 +25,6 @@ jobs:
       - name: Build main.sh
         env:
           ARTIFACT_URL: ${{ needs.build-linux-kernel.outputs.kernel-artifact-url }}
-          PYTHON: ${{ steps.py312.outputs.python-path }}
         run: |
           cargo test --no-run
           # Yes, there appears to be no way to just retrieve the
@@ -45,7 +44,7 @@ jobs:
           unzip artifact.zip
           cat <<EOF > main.sh
             set -e
-            export PYTHON=${PYTHON}
+            export PYTHON=${{ steps.py312.outputs.python-path }}
             cargo test --features=dont-generate-unit-test-files -- --include-ignored
           EOF
           cat main.sh