Specify on action instead of toolchain file

Author: jeffcharles

.github/workflows/ci.yml

@@ -22,9 +22,9 @@ jobs:
         uses: oxidize-rb/actions/fetch-ci-data@v1
         with:
           stable-ruby-versions: |
-              # See https://github.com/bytecodealliance/wasmtime-rb/issues/286
-              # for details.
-              exclude: [head]
+            # See https://github.com/bytecodealliance/wasmtime-rb/issues/286
+            # for details.
+            exclude: [head]
 
   ci:
     runs-on: ${{ matrix.os }}
@@ -35,10 +35,10 @@ jobs:
         os: ["ubuntu-latest", "macos-latest", "windows-latest"]
         ruby: ${{ fromJSON(needs.ci-data.outputs.result).stable-ruby-versions }}
         # include:
-          # mswin relies on head and we're not creating releases for it
-          # so disabling it as well.
-          # - os: windows-latest
-          #   ruby: mswin
+        # mswin relies on head and we're not creating releases for it
+        # so disabling it as well.
+        # - os: windows-latest
+        #   ruby: mswin
     steps:
       - uses: actions/checkout@v4
 
@@ -51,6 +51,7 @@ jobs:
           bundler-cache: true
           cargo-cache: true
           cache-version: v5
+          rustup-toolchain: 1.86.0
 
       - name: Compile rust ext
         run: bundle exec rake compile:release