fix(ci): publish preview only when build done, save CI: don't build twice, remove not working expiration (#812)

Reviewed-on: https://codeberg.org/Codeberg/Documentation/pulls/812

.woodpecker/build.yaml

@@ -1,5 +1,4 @@
 when:
-  - event: [pull_request]
   - event: push
     branch:
       - ${CI_REPO_DEFAULT_BRANCH}

.woodpecker/deploy-preview.yaml

@@ -15,6 +15,7 @@ steps:
       with: pnpm
       frozen_lockfile: true
       ignore_node_modules: true
+    depends_on: change-path
 
   deploy-preview:
     image: codeberg.org/gedankenstuecke/git-pages-woodpecker-plugin:v2
@@ -24,7 +25,7 @@ steps:
       TOKEN:
         from_secret: surge_forge_token
       UPLOAD_DIR: _site
-      EXPIRES: 30
+    depends_on: build
 
   comment:
     image: mcs94/gitea-comment
@@ -32,5 +33,5 @@ steps:
       gitea_address: https://codeberg.org
       gitea_token:
         from_secret: surge_forge_token
-      comment: 'Preview ready: https://codeberg.codeberg.page/documentation/pull_${CI_COMMIT_PULL_REQUEST} (expires in 30 days)'
+      comment: 'Preview ready: https://codeberg.codeberg.page/documentation/pull_${CI_COMMIT_PULL_REQUEST}'
     depends_on: deploy-preview