ci: build only the osx-arm64 macOS target

.github/workflows/build.yml

@@ -27,8 +27,6 @@ jobs:
             os: windows-latest
           - rid: linux-x64
             os: ubuntu-latest
-          - rid: osx-x64
-            os: macos-15-intel
           - rid: osx-arm64
             os: macos-15
     defaults:

README.md

@@ -16,7 +16,7 @@ dotnet run --project YKanBan -- <path>
 
 Packages are pinned in `YKanBan/YKanBan.csproj`.
 
-Release archives for win-x64, linux-x64, osx-x64 and osx-arm64 are produced by the manually triggered workflow in `.github/workflows/build.yml`; `packaging/package.sh` packs one published RID.
+Release archives for win-x64, linux-x64 and osx-arm64 are produced by the manually triggered workflow in `.github/workflows/build.yml`; `packaging/package.sh` packs one published RID.
 
 ## License