fix: clean up some minor issues with .github/workflows/ci.yml (#4408)

.github/workflows/ci.yml

@@ -1,7 +1,7 @@
 name: ci
 
 on:
-  pull_request: { branches: [main] }
+  pull_request: {}
   push: { branches: [main] }
 
 jobs:
@@ -31,6 +31,7 @@ jobs:
       - uses: facebook/install-dotslash@v2
 
       - name: Stage npm package
+        id: stage_npm_package
         env:
           GH_TOKEN: ${{ github.token }}
         run: |
@@ -40,13 +41,13 @@ jobs:
           python3 ./codex-cli/scripts/build_npm_package.py \
             --release-version "$CODEX_VERSION" \
             --pack-output "$PACK_OUTPUT"
-          echo "PACK_OUTPUT=$PACK_OUTPUT" >> "$GITHUB_ENV"
+          echo "pack_output=$PACK_OUTPUT" >> "$GITHUB_OUTPUT"
 
       - name: Upload staged npm package artifact
         uses: actions/upload-artifact@v4
         with:
           name: codex-npm-staging
-          path: ${{ env.PACK_OUTPUT }}
+          path: ${{ steps.stage_npm_package.outputs.pack_output }}
 
       - name: Ensure root README.md contains only ASCII and certain Unicode code points
         run: ./scripts/asciicheck.py README.md