Add a test job that uses a fixed Rust version and Cargo.lock

.github/workflows/ci.yml

@@ -50,6 +50,26 @@ jobs:
           files: lcov.info
           fail_on_error: true
 
+  # This is supposed to factor out possible bugs introduced by Rust compiler changes
+  # and dependency changes, making the results more reproducible.
+  stable-test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        include:
+          - target: x86_64-unknown-linux-gnu
+            rust: 1.81.0 # MSRV
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@v1
+        with:
+          toolchain: ${{ matrix.rust }}
+          target: ${{ matrix.target }}
+          profile: minimal
+          override: true
+      - run: ${{ matrix.deps }}
+      - run: cargo test --workspace --locked --all-features --target ${{ matrix.target }}
+
   clippy:
     runs-on: ubuntu-latest
     steps:

.gitignore

@@ -1,4 +1,3 @@
 /target
-Cargo.lock
 *.sublime-project
 *.sublime-workspace