CI: Add a MSRV job

.github/workflows/ci.yml

@@ -82,6 +82,30 @@ jobs:
       - name: Build
         run: cargo build --package niri-visual-tests
 
+  msrv:
+    strategy:
+      fail-fast: false
+
+    name: 'msrv - 1.72.0'
+    runs-on: ubuntu-22.04
+    container: ubuntu:23.10
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          show-progress: false
+
+      - name: Install dependencies
+        run: |
+          apt-get update -y
+          apt-get install -y curl gcc clang libudev-dev libgbm-dev libxkbcommon-dev libegl1-mesa-dev libwayland-dev libinput-dev libdbus-1-dev libsystemd-dev libseat-dev libpipewire-0.3-dev libpango1.0-dev libadwaita-1-dev
+
+      - uses: dtolnay/rust-toolchain@1.72.0
+
+      - uses: Swatinem/rust-cache@v2
+
+      - run: cargo check --all-targets
+
   clippy:
     strategy:
       fail-fast: false