Avoid sudo in opam install step

Author: francoisthire

.github/workflows/build.yml

@@ -29,7 +29,7 @@ jobs:
         run: |
           opam update
           opam upgrade
-          opam install . --deps-only -t
+          opam install . --deps-only -t --yes --no-depexts
       - name: Build Bam
         run: |
           eval $(opam env)