skip[ci]: update miri to use runs on (#7019)

Author: joseph-isaacs

.github/workflows/ci.yml

@@ -756,22 +756,24 @@ jobs:
 
   miri:
     name: "Rust tests (miri)"
-    runs-on: ubuntu-latest
+    runs-on: >-
+      ${{ github.repository == 'vortex-data/vortex'
+          && format('runs-on={0}/runner=amd64-medium/image=ubuntu24-full-x64-pre-v2/tag=rust-miri', github.run_id)
+          || 'ubuntu-latest' }}
     timeout-minutes: 120
     env:
       MIRIFLAGS: -Zmiri-strict-provenance -Zmiri-symbolic-alignment-check -Zmiri-disable-isolation -Zmiri-env-forward=RUST_BACKTRACE
       RUSTFLAGS: "-A warnings --cfg vortex_nightly"
       RUST_BACKTRACE: full
     steps:
-      - uses: actions/checkout@v6
-      - uses: ./.github/actions/setup-rust
-        with:
-          repo-token: ${{ secrets.GITHUB_TOKEN }}
-          toolchain: ${{ env.NIGHTLY_TOOLCHAIN }}
-          components: "rust-src, rustfmt, clippy, miri"
-      - uses: taiki-e/install-action@v2
+      - uses: runs-on/action@v2
+        if: github.repository == 'vortex-data/vortex'
         with:
-          tool: nextest
+          sccache: s3
+      - uses: actions/checkout@v6
+      - uses: ./.github/actions/setup-prebuild
+      - name: Install nightly with miri
+        run: rustup toolchain install $NIGHTLY_TOOLCHAIN --component rust-src,rustfmt,clippy,miri
       - name: Run Miri
         run: cargo +$NIGHTLY_TOOLCHAIN miri nextest run --no-fail-fast -p vortex-buffer -p vortex-ffi