Combine build and image optimization steps in CI

.drone.yml

@@ -28,6 +28,7 @@ steps:
   depends_on:
   - install-deps
   commands:
+  - npm run build:images
   - npm run build:web
 
 - name: generate-calendar
@@ -37,19 +38,11 @@ steps:
   commands:
   - npm run build:calendar
 
-- name: optimize-images
-  image: node:16
-  depends_on:
-  - install-deps
-  commands:
-  - npm run build:images
-
 - name: export
   image: node:16
   depends_on:
   - build
   - generate-calendar
-  - optimize-images
   commands:
   - npm run export