fixup! use normal ubuntu runner

Author: marco-ippolito

.github/workflows/build-tarball.yml

@@ -65,6 +65,7 @@ env:
   PYTHON_VERSION: '3.14'
   FLAKY_TESTS: keep_retrying
   CLANG_VERSION: '19'
+  RUSTC_VERSION: '1.85'
 
 permissions:
   contents: read
@@ -84,6 +85,11 @@ jobs:
           allow-prereleases: true
       - name: Environment Information
         run: npx envinfo
+      - name: Install Rust ${{ env.RUSTC_VERSION }}
+        if: ${{ github.event_name != 'workflow_dispatch' }}
+        run: |
+          rustup override set "$RUSTC_VERSION"
+          rustup --version
       - name: Make tarball
         run: |
           export DISTTYPE=nightly
@@ -114,6 +120,11 @@ jobs:
         uses: ./.github/actions/install-clang
         with:
           clang-version: ${{ env.CLANG_VERSION }}
+      - name: Install Rust ${{ env.RUSTC_VERSION }}
+        if: ${{ github.event_name != 'workflow_dispatch' }}
+        run: |
+          rustup override set "$RUSTC_VERSION"
+          rustup --version
       - name: Set up Python ${{ env.PYTHON_VERSION }}
         uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with: