fix

Author: cknitt

.github/workflows/ci.yml

@@ -260,6 +260,7 @@ jobs:
 
       - name: Get OPAM environment
         if: steps.cache-opam-env.outputs.cache-hit != 'true'
+        shell: bash
         run: |
           command -v opam | tee .opam-path
           opam env > .opam-env
@@ -353,7 +354,9 @@ jobs:
       - name: "Check if syntax subfolder has changed"
         id: syntax-diff
         shell: bash
-        run: >-
+        env:
+          SHELLOPTS: igncr # see https://github.com/ocaml/setup-ocaml/issues/815
+        run: |
           if git diff --name-only --exit-code HEAD^ HEAD -- jscomp/syntax; then
             echo "syntax_status=unchanged" >> $GITHUB_ENV
           else