Add Windows signing secret smoke test

.github/workflows/rust-release-windows.yml

@@ -26,7 +26,52 @@ env:
   CARGO_NET_GIT_FETCH_WITH_CLI: "true"
 
 jobs:
+  validate-signing-secrets:
+    name: Validate Azure signing secrets
+    runs-on: ubuntu-latest
+    environment:
+      name: azure-artifact-signing
+    permissions:
+      contents: read
+    env:
+      AZURE_TRUSTED_SIGNING_CLIENT_ID: ${{ secrets.AZURE_TRUSTED_SIGNING_CLIENT_ID }}
+      AZURE_TRUSTED_SIGNING_TENANT_ID: ${{ secrets.AZURE_TRUSTED_SIGNING_TENANT_ID }}
+      AZURE_TRUSTED_SIGNING_SUBSCRIPTION_ID: ${{ secrets.AZURE_TRUSTED_SIGNING_SUBSCRIPTION_ID }}
+      AZURE_TRUSTED_SIGNING_ENDPOINT: ${{ secrets.AZURE_TRUSTED_SIGNING_ENDPOINT }}
+      AZURE_TRUSTED_SIGNING_ACCOUNT_NAME: ${{ secrets.AZURE_TRUSTED_SIGNING_ACCOUNT_NAME }}
+      AZURE_TRUSTED_SIGNING_CERTIFICATE_PROFILE_NAME: ${{ secrets.AZURE_TRUSTED_SIGNING_CERTIFICATE_PROFILE_NAME }}
+    steps:
+      - name: Validate required Azure signing secrets are available
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          required=(
+            AZURE_TRUSTED_SIGNING_CLIENT_ID
+            AZURE_TRUSTED_SIGNING_TENANT_ID
+            AZURE_TRUSTED_SIGNING_SUBSCRIPTION_ID
+            AZURE_TRUSTED_SIGNING_ENDPOINT
+            AZURE_TRUSTED_SIGNING_ACCOUNT_NAME
+            AZURE_TRUSTED_SIGNING_CERTIFICATE_PROFILE_NAME
+          )
+
+          missing=()
+          for name in "${required[@]}"; do
+            if [[ -z "${!name}" ]]; then
+              missing+=("$name")
+            fi
+          done
+
+          if ((${#missing[@]})); then
+            printf 'Missing required secret: %s\n' "${missing[@]}" >&2
+            exit 1
+          fi
+
+          echo "All required Azure Trusted Signing secrets are available."
+
   build-windows-binaries:
+    # Temporarily disabled while this PR smoke-tests secret access.
+    if: ${{ false }}
     name: Build Windows binaries - ${{ matrix.runner }} - ${{ matrix.target }} - ${{ matrix.bundle }}
     runs-on: ${{ matrix.runs_on }}
     # Windows release builds can exceed an hour on fat-LTO mainline releases,
@@ -146,6 +191,8 @@ jobs:
             codex-rs/target/${{ matrix.target }}/release/staged-${{ matrix.bundle }}/*
 
   build-windows:
+    # Temporarily disabled while this PR smoke-tests secret access.
+    if: ${{ false }}
     needs:
       - build-windows-binaries
     name: Build - ${{ matrix.runner }} - ${{ matrix.target }}