ci(kernel-rc-cross-os): attach jobs to azure-prod environment for e2e secrets

The DATABRICKS_HOST / TEST_PECO_WAREHOUSE_HTTP_PATH / DATABRICKS_TOKEN secrets
are scoped to the azure-prod environment (as in main.yml), not repo-level.
Without 'environment: azure-prod' the jobs saw empty creds and failed at
assertEnv. azure-prod has no protection rules / branch restriction, so
push-triggered runs proceed without approval.

Co-authored-by: Isaac

Author: msrathore-db

.github/workflows/kernel-rc-cross-os.yml

@@ -40,6 +40,7 @@ jobs:
   suite:
     name: ${{ matrix.label }} · node ${{ matrix.node }}
     runs-on: ${{ matrix.os }}
+    environment: azure-prod        # e2e secrets (DATABRICKS_*) are scoped to this environment
     timeout-minutes: 40
     strategy:
       fail-fast: false
@@ -88,6 +89,7 @@ jobs:
   linux-musl:
     name: ${{ matrix.label }} · ${{ matrix.image }}
     runs-on: ${{ matrix.runner }}
+    environment: azure-prod        # e2e secrets (DATABRICKS_*) are scoped to this environment
     timeout-minutes: 40
     strategy:
       fail-fast: false