chore: only run PR previews when needed (#219)

Author: franky47

.github/workflows/pr-preview.yml

@@ -3,6 +3,13 @@ name: PR Preview
 on:
   pull_request_target:
     types: [opened, synchronize, reopened]
+    paths:
+      - "src/**/*.ts"
+      - "!src/**/*.test.ts"
+      - "Dockerfile"
+      - "package.json"
+      - "pnpm-lock.yaml"
+      - "tsconfig.json"
 
 jobs:
   request-approval:

Dockerfile

@@ -1,5 +1,9 @@
 FROM node:24.9.0-slim AS builder
 
+# Note: when updating things that go into this Docker image (with COPY or RUN),
+# make sure to update the allow-list in the .github/workflows/pr-preview.yml
+# workflow `on.pull_request_target.paths` section, so it gets rebuilt when needed.
+
 WORKDIR /action
 
 COPY package.json pnpm-lock.yaml  ./