Add (only) miri workflow

github/workflows/miri.yml

@@ -0,0 +1,25 @@
+on:
+  push:
+    branches: [main]
+  pull_request:
+name: Miri
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - run: |
+          echo "NIGHTLY=nightly-$(curl -s https://rust-lang.github.io/rustup-components-history/x86_64-unknown-linux-gnu/miri)" >> $GITHUB_ENV
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ env.NIGHTLY }}
+          override: true
+          components: miri
+      - uses: actions/checkout@v2
+      - name: cargo miri test
+        uses: actions-rs/cargo@v1
+        with:
+          command: miri
+          args: test
+        env:
+          MIRIFLAGS: "-Zmiri-tag-raw-pointers"