Check MSRV weekly and on PR/push

.github/workflows/ci.yml

@@ -7,6 +7,10 @@ on:
     branches:
       - main
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
   check:
     runs-on: ubuntu-latest

.github/workflows/scheduled.yml

@@ -0,0 +1,28 @@
+---
+name: Scheduled jobs
+
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+  schedule:
+    # Every Monday at 14:45 UTC
+    - cron: '45 14 * * 1'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  msrv:
+    name: msrv
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - run: cargo install cargo-msrv
+      - run: cargo msrv --output-format json verify -- cargo check --all-targets
+      # If the verify fails, find the actual MSRV
+      - run: cargo msrv --output-format json -- cargo check --all-targets
+        if: ${{ failure() }}