reduce linkinator concurrency from 300 to 100 (#28176)

* reduce linkinator concurrency from 300 to 100

* reduce it and use self-hosted

* try again

* actually do concurrency of 10

* move the override to the Action workflow

* typo

* avoid memory bloat

* rename

* back to 100

* set LINKINATOR_CONCURRENCY on the right thing

* remove some debugging

.github/workflows/check-all-english-links.yml

@@ -58,9 +58,6 @@ jobs:
           REQUEST_TIMEOUT: 20000
           # Don't care about CDN caching image URLs
           DISABLE_REWRITE_ASSET_URLS: true
-          # The default is 300 which works OK on a fast macbook pro
-          # but so well in Actions.
-          LINKINATOR_CONCURRENCY: 100
         run: |
           node server.mjs > /tmp/stdout.log 2> /tmp/stderr.log &
           sleep 5
@@ -75,6 +72,10 @@ jobs:
           cat /tmp/stderr.log
 
       - name: Run script
+        env:
+          # The default is 300 which works OK on a fast macbook pro
+          # but not so well in Actions.
+          LINKINATOR_CONCURRENCY: 100
         run: |
           script/check-english-links.js > broken_links.md
 
@@ -86,11 +87,6 @@ jobs:
       #
       # https://docs.github.com/actions/reference/context-and-expression-syntax-for-github-actions#job-status-check-functions
 
-      - if: ${{ failure() }}
-        name: Debug broken_links.md
-        run: |
-          ls -lh broken_links.md
-          wc -l broken_links.md
       - uses: actions/upload-artifact@6673cd052c4cd6fcf4b4e6e60ea986c889389535
         if: ${{ failure() }}
         with: