Use astro build --outDir instead of copying dist to another dir

This ensures that the outDir is clean and doesn't contain old files from previous builds

.woodpecker.yml

@@ -7,9 +7,7 @@ steps:
     preview:
         image: fish
         commands:
-            - $HOME/.bun/bin/bun astro build
-            - mkdir -p /srv/http/zine-preview
-            - cp -r dist/* /srv/http/zine-preview
+            - $HOME/.bun/bin/bun astro build --outDir /srv/http/zine-preview
         when:
             event: ['deployment']
             path:
@@ -17,9 +15,7 @@ steps:
     build:
         image: fish
         commands:
-            - $HOME/.bun/bin/bun astro build
-            - mkdir -p /srv/http/zine
-            - cp -r dist/* /srv/http/zine
+            - $HOME/.bun/bin/bun astro build --outDir /srv/http/zine
         when:
             branch: main
             event: ['push', 'deployment']