fix(ci): skip Railway deployment and Coveralls upload when tokens unavailable

Dependabot PRs lack access to repository secrets, causing workflow failures.
This change adds token availability checks with informative warnings, allowing
CI to complete successfully while skipping deployment steps that require secrets.

Coverage generation still runs to maintain build verification, but upload is
conditional on token availability.

.github/workflows/deploy.yaml

@@ -132,8 +132,17 @@ jobs:
     env:
       RAILWAY_TOKEN: ${{ secrets.RAILWAY_TOKEN }}
     steps:
+      - name: Check Railway Token
+        run: |
+          if [ -z "$RAILWAY_TOKEN" ]; then
+            echo "::warning::RAILWAY_TOKEN not available - deployment skipped (common for Dependabot PRs)"
+            exit 0
+          fi
+
       - name: Generate proxy Dockerfile
+        if: env.RAILWAY_TOKEN != ''
         run: echo "FROM ghcr.io/xevion/pac-man@${{ needs.build-and-deploy.outputs.digest }}" > Dockerfile
 
       - name: Deploy to Railway
+        if: env.RAILWAY_TOKEN != ''
         run: railway up --service pac-man