Fix ci (#87)

Author: zshipko

.github/workflows/ocaml.yml

@@ -28,7 +28,7 @@ jobs:
         with:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
       - name: Set Opam env
-        run: opam env >> $GITHUB_ENV
+        run: opam env | tr '\n' ' ' >> $GITHUB_ENV
       - name: Add Opam switch to PATH
         run: opam var bin >> $GITHUB_PATH
       - run: opam install dune ppx_inline_test
@@ -55,7 +55,7 @@ jobs:
         with:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
       - name: Set Opam env
-        run: opam env >> $GITHUB_ENV
+        run: opam env | tr '\n' ' ' >> $GITHUB_ENV
       - name: Add Opam switch to PATH
         run: opam var bin >> $GITHUB_PATH
       - run: opam install dune ppx_inline_test notty bechamel-notty

.github/workflows/rust.yml

@@ -29,7 +29,7 @@ jobs:
         with:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
       - name: Set Opam env
-        run: opam env >> $GITHUB_ENV
+        run: opam env | tr '\n' ' ' >> $GITHUB_ENV
       - name: Add Opam switch to PATH
         run: opam var bin >> $GITHUB_PATH
       - name: Build