fix(ci): correct image for generating slate docs

.woodpecker/docs.yml

@@ -22,16 +22,18 @@ pipeline:
 
   slate-docs:
     image: 'slatedocs/slate'
-    pull: true
     group: 'generate'
+    # Slate requires a specific directory to run in
+    directory: '/srv/slate'
     commands:
-      - cd docs/api
+      - mv "${CI_WORKSPACE}/docs/api" source
       - bundle exec middleman build --clean --watcher-disable
+      - mv build "${CI_WORKSPACE}/docs/api-build"
 
   archive:
     image: 'alpine'
     commands:
-      - cp -r docs/api/build docs/public/api
+      - cp -r docs/api-build docs/public/api
       - 'cd docs/public && tar czvf ../../docs.tar.gz *'
       - 'cd ../../src/_docs && tar czvf ../../api-docs.tar.gz *'
     when: