ci: ignore re2 failures for now

See mudge/re2#158 for discussion about
abseil/cmake conflicts.

.github/workflows/downstream.yml

@@ -25,11 +25,13 @@ jobs:
       matrix:
         name: [re2, nokogiri, sqlite3]
         platform: [ubuntu-latest, windows-latest, macos-latest]
+        continue-on-error: [false]
         include:
           - name: re2
             url: https://github.com/mudge/re2
             command: "bundle exec rake compile spec"
             ruby: "3.3"
+            continue-on-error: true # https://github.com/mudge/re2/issues/158
           - name: nokogiri
             url: https://github.com/sparklemotion/nokogiri
             command: "bundle exec rake compile test"
@@ -38,6 +40,7 @@ jobs:
             url: https://github.com/sparklemotion/sqlite3-ruby
             command: "bundle exec rake compile test"
             ruby: "3.3"
+    continue-on-error: ${{matrix.continue-on-error}}
     runs-on: ${{matrix.platform}}
     steps:
       - name: configure git crlf