Add node anchor to .drone.yml

Partially to remove some repetetetetition, but also so I know they exist.

.drone.yml

@@ -59,7 +59,7 @@ workspace:
 steps:
   - name: deploy (production)
     image: dockette/vercel
-    environment:
+    environment: &vercel_secrets
       VERCEL_TOKEN:
         from_secret: VERCEL_TOKEN
       VERCEL_SCOPE:
@@ -72,11 +72,7 @@ steps:
         - main
   - name: deploy (preview)
     image: dockette/vercel
-    environment:
-      VERCEL_TOKEN:
-        from_secret: VERCEL_TOKEN
-      VERCEL_SCOPE:
-        from_secret: VERCEL_SCOPE
+    environment: *vercel_secrets
     commands:
       - export VERCEL_BUILD_URL=$(vercel -t $VERCEL_TOKEN --scope $VERCEL_SCOPE -c)
       - echo VERCEL_BUILD_URL=$VERCEL_BUILD_URL >> .env