Try setting CC=musl-gcc

Signed-off-by: Kevin Svetlitski <ksvetlitski@janestreet.com>

Author: Svetlitski

.github/workflows/build.yml

@@ -62,26 +62,20 @@ jobs:
           cd ..
           rm -rf musl-zstd
 
-      - name: Show disk usage
-        run: |
-          # For debugging only!
-          curl -L 'https://github.com/bootandy/dust/releases/download/v1.2.3/dust-v1.2.3-x86_64-unknown-linux-gnu.tar.gz' | tar -xz --strip-components=1
-          chmod +x ./dust
-          sudo ./dust --no-progress /
-
       - name: Use OCaml ${{ matrix.ocaml-version }}
         run: |
           sudo wget -O /usr/local/bin/opam https://github.com/ocaml/opam/releases/download/2.1.2/opam-2.1.2-x86_64-linux
           sudo chmod a+x /usr/local/bin/opam
 
           export OPAMYES=1
           export OPAMJOBS=$(($(nproc) + 2))
+          export CC=musl-gcc
           echo "OPAMYES=1" >> "$GITHUB_ENV"
           echo "OPAMJOBS=$OPAMJOBS" >> "$GITHUB_ENV"
-          rm -rf /tmp/* >/dev/null 2>&1 || true
+          echo "CC=musl-gcc" >> "$GITHUB_ENV"
 
           opam init --bare -yav https://github.com/ocaml/opam-repository.git
-          opam switch create ${{ matrix.ocaml-version }} --repos ox=git+https://github.com/oxcaml/opam-repository.git,default --packages=ocaml-variants.${{ matrix.ocaml-version }}+options,ocaml-option-musl
+          opam switch create ${{ matrix.ocaml-version }} --repos ox=git+https://github.com/oxcaml/opam-repository.git,default
 
           opam switch set ${{ matrix.ocaml-version }}