ci: Check MSRV

Author: robin-nitrokey

.github/workflows/ci.yml

@@ -45,3 +45,27 @@ 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
+
+      - name: Install build dependencies
+        shell: bash
+        run: |
+          sudo apt-get update -y -qq && sudo apt-get install -y -qq llvm libc6-dev-i386 libclang-dev
+
+      - uses: fiam/arm-none-eabi-gcc@v1
+        with:
+          release: "9-2020-q2"
+
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: 1.87
+          target: thumbv7em-none-eabi
+          override: true
+          components: llvm-tools-preview
+
+      - name: Build
+        run: cargo build --release --all-features --target thumbv7em-none-eabi