Changes since version 2.5.4 :

Ilya Shipitsin (3):
      CI: github actions: use cache for OpenTracing
      CI: refactor OpenTracing build script
      CI: github actions: use cache for SSL libs

Tim Duesterhus (1):
      CI: Consistently use actions/checkout@v2

Willy Tarreau (1):
      CI: github actions: add the output of $CC -dM -E-