Add a CI workflow to check the stable branch with nightly compiler ou…

…tput

.github/workflows/nightly.yml

@@ -0,0 +1,27 @@
+name: Check stable branch with nightly compiler
+
+on:
+  push:
+
+jobs:
+  check-stable:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        ref: stable
+    - uses: actions-rs/toolchain@v1
+      with:
+        toolchain: nightly
+    - name: Build
+      run: cargo build --verbose --all
+    - name: Generate self-profile
+      run: RUSTFLAGS="-Zself-profile" cargo build --bin crox
+    - name: Check crox
+      run: ./target/debug/crox crox-*.mm_profdata
+    - name: Check flamegraph
+      run: ./target/debug/flamegraph crox-*.mm_profdata
+    - name: Check stack_collapse
+      run: ./target/debug/stack_collapse *.mm_profdata
+    - name: Check summarize
+      run: ./target/debug/summarize summarize crox-*.mm_profdata