ci: Check MSRV

Author: robin-nitrokey

.github/workflows/ci.yml

@@ -45,3 +45,16 @@ jobs:
         run: cargo build --verbose --examples --target ${{ matrix.target }}
         if: matrix.target != 'x86_64-unknown-linux-gnu'
 
+  build-msrv:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: 1.87
+          override: true
+
+      - name: Build
+        run: cargo build --release --all-features --all-targets