Vendor deps.

vendor/once_cell/.github/workflows/ci.yaml

@@ -0,0 +1,28 @@
+name: CI
+on:
+  pull_request:
+  push:
+    branches: ["master", "staging", "trying"]
+
+env:
+  CARGO_INCREMENTAL: 0
+  CARGO_NET_RETRY: 10
+  CI: 1
+  RUST_BACKTRACE: short
+  RUSTFLAGS: -D warnings
+  RUSTUP_MAX_RETRIES: 10
+
+jobs:
+  test:
+    name: Rust
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0 # fetch tags for publish
+    - uses: Swatinem/rust-cache@359a70e43a0bb8a13953b04a90f76428b4959bb6
+    - run: cargo run -p xtask -- ci
+      env:
+        CARGO_REGISTRY_TOKEN: ${{ secrets.CRATES_IO_TOKEN }}
+        MIRIFLAGS: -Zmiri-strict-provenance