update ci setting

Author: KATO Daisuke

.github/workflows/ci.yml

@@ -18,9 +18,24 @@ jobs:
       matrix:
         os:
           - ubuntu-latest
-          - macos-latest
-          - windows-latest
+          # - macos-latest
+          # - windows-latest
     steps:
+      - name: Free Disk Space (Ubuntu)
+        uses: jlumbroso/free-disk-space@main
+        with:
+          # this might remove tools that are actually needed,
+          # if set to "true" but frees about 6 GB
+          tool-cache: false
+          
+          # all of these default to true, but feel free to set to
+          # "false" if necessary for your workflow
+          android: true
+          dotnet: true
+          haskell: true
+          large-packages: true
+          docker-images: true
+          swap-storage: true
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with: