[chore] Add js lint step (#35)

Reviewed-on: https://codeberg.org/superseriousbusiness/masto-fe-standalone/pulls/35
Co-authored-by: tobi <tobi.smethurst@protonmail.com>
Co-committed-by: tobi <tobi.smethurst@protonmail.com>

.woodpecker/lint.yaml

@@ -0,0 +1,23 @@
+steps:
+  lint:
+    image: node:22-alpine
+    pull: true
+    
+    # https://woodpecker-ci.org/docs/usage/volumes
+    volumes:
+      - /woodpecker/masto-fe-standalone/node_modules:/woodpecker/src/codeberg.org/superseriousbusiness/masto-fe-standalone/node_modules
+      - /woodpecker/masto-fe-standalone/.eslintcache:/woodpecker/src/codeberg.org/superseriousbusiness/masto-fe-standalone/.eslintcache
+    
+    # https://woodpecker-ci.org/docs/administration/configuration/backends/docker#run-user
+    backend_options:
+      docker:
+        user: 1000:1000
+    
+    # https://woodpecker-ci.org/docs/usage/workflow-syntax#commands
+    commands:
+      - yarn
+      - yarn lint:js
+    
+    # https://woodpecker-ci.org/docs/usage/workflow-syntax#when---conditional-execution
+    when:
+      - event: pull_request