Disable format check on Windows and macOS

.github/workflows/ci.yml

@@ -57,16 +57,11 @@ jobs:
       - run: julia -e 'using InteractiveUtils; versioninfo(verbose=true)'
       - uses: julia-actions/cache@v1
       - name: Apply JuliaFormatter and check format
+        if: matrix.os == 'ubuntu-latest'
         run: |
-          using Pkg
-          Pkg.add("JuliaFormatter")
-
-          using JuliaFormatter
-
-          is_unchanged = format(".", verbose=true)
-          if !is_unchanged
-            error("Code not properly formatted")
-          end
+          julia -e 'using Pkg; Pkg.add("JuliaFormatter")'
+          julia -e 'using JuliaFormatter; !format(".", verbose=true) &&
+            error("Code not properly formatted")'
         shell: julia --color=yes {0}
       - name: Build package
         uses: julia-actions/julia-buildpkg@v1