Fix link check failures (#2173)

Author: trask

.github/scripts/lychee-config.toml

@@ -6,11 +6,7 @@ max_concurrency = 4
 # Check link anchors
 include_fragments = true
 
-# excluding links to pull requests and issues is done for performance
-# sonatype snapshots are currrently unbrowseable
 exclude = [
+  # excluding links to pull requests and issues is done for performance
   "^https://github.com/open-telemetry/opentelemetry-java-contrib/(issues|pull)/\\d+$",
-  '^https://central.sonatype.com/service/rest/repository/browse/maven-snapshots/io/opentelemetry/contrib/$',
 ]
-
-

.github/workflows/reusable-link-check.yml

@@ -33,14 +33,27 @@ jobs:
           echo "files=$modified_files" >> $GITHUB_OUTPUT
           echo "Modified files: $modified_files"
 
+      - name: Check if lychee config was modified
+        if: github.event_name == 'pull_request'
+        id: config-check
+        run: |
+          merge_base=$(git merge-base origin/${{ github.base_ref }} HEAD)
+          config_modified=$(git diff --name-only $merge_base...${{ github.event.pull_request.head.sha }} \
+                            | grep -E '\.github/scripts/(lychee-config\.toml|link-check\.sh|dependencies\.Dockerfile)$' || true)
+          if [ -n "$config_modified" ]; then
+            echo "modified=true" >> $GITHUB_OUTPUT
+          else
+            echo "modified=false" >> $GITHUB_OUTPUT
+          fi
+
       - name: Link check - all links (modified files only)
         if: github.event_name == 'pull_request' && steps.modified-files.outputs.files != ''
         env:
           GITHUB_TOKEN: ${{ github.token }}
         run: ./.github/scripts/link-check.sh ${{ steps.modified-files.outputs.files }}
 
       - name: Link check - all links (all files)
-        if: github.event_name != 'pull_request'
+        if: github.event_name != 'pull_request' || steps.config-check.outputs.modified == 'true'
         env:
           GITHUB_TOKEN: ${{ github.token }}
         run: ./.github/scripts/link-check.sh