Update ci.yml

Author: Peiyang-Song

.github/workflows/ci.yml

@@ -40,30 +40,3 @@ jobs:
           ~/.elan/bin/lake exe LeanCopilot/download
       - name: Build tests
         run: ~/.elan/bin/lake build LeanCopilotTests
-
-  build-beta:
-    runs-on: windows-latest
-    name: BuildBeta
-    continue-on-error: true
-    steps:
-      - name: Checkout project
-        uses: actions/checkout@v5
-        with:
-          fetch-depth: 0
-      - name: Install Git LFS
-        run: |
-          git lfs update --force
-          git lfs install
-      - name: Set up elan
-        run: curl https://raw.githubusercontent.com/leanprover/elan/master/elan-init.sh -sSf | sh -s -- -y
-      - name: Add .lake/build/lib to PATH
-        shell: bash
-        run: |
-          echo "$GITHUB_WORKSPACE/.lake/build/lib" >> $GITHUB_PATH
-      - name: Build project
-        run: ~/.elan/bin/lake build
-      - name: Download model
-        run: |
-          ~/.elan/bin/lake exe LeanCopilot/download
-      - name: Build tests
-        run: ~/.elan/bin/lake build LeanCopilotTests