(fix): verify the actor token before building

.github/workflows/build-dataset.yml

@@ -33,6 +33,8 @@ jobs:
   build:
     runs-on: ubuntu-latest
     timeout-minutes: 60
+    env:
+      HAS_ACTOR_TOKEN: ${{ secrets.ACTOR_TOKEN != '' }}
     steps:
       - uses: actions/checkout@v4
         with:
@@ -40,6 +42,18 @@ jobs:
           token: ${{ secrets.ACTOR_TOKEN || github.token }}
           fetch-depth: 0
 
+      - name: check actor token
+        if: env.HAS_ACTOR_TOKEN == 'true'
+        env:
+          GH_TOKEN: ${{ secrets.ACTOR_TOKEN }}
+        run: |
+          echo "token belongs to: $(gh api user --jq .login 2>/dev/null || echo '<not a valid user token>')"
+          for r in lostflux/functional-scraper lostflux/ai-tech-articles; do
+            echo "$r: $(gh api repos/$r --jq '.permissions' 2>/dev/null || echo 'no access (404/403)')"
+          done
+          gh api repos/${{ github.repository }} --jq '.permissions.push' 2>/dev/null | grep -q true \
+            || { echo "::error::ACTOR_TOKEN cannot push to ${{ github.repository }}: for an org repo the fine-grained PAT needs resource owner 'lostflux', this repo in its repository list, Contents read+write, and org approval if required"; exit 1; }
+
       - uses: actions/checkout@v4
         with:
           repository: lostflux/functional-scraper