Document MSRV and check it in CI

Author: robin-nitrokey

.github/workflows/ci.yml

@@ -85,3 +85,13 @@ jobs:
 
       - name: Build avr
         run: RUSTFLAGS="-C target-cpu=atmega328p" cargo +nightly build -Z build-std=core --target=avr-none --workspace --release
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - name: Install Rust toolchain
+        run: rustup override set 1.73
+      - name: Build
+        run: cargo build --workspace --all-features
+

Cargo.toml

@@ -5,6 +5,7 @@ members = ["core"]
 edition = "2021"
 license = "Apache-2.0 OR MIT"
 repository = "https://github.com/trussed-dev/littlefs2"
+rust-version = "1.73"
 
 [package]
 name = "littlefs2"
@@ -18,6 +19,7 @@ documentation = "https://docs.rs/littlefs2"
 edition.workspace = true
 license.workspace = true
 repository.workspace = true
+rust-version.workspace = true
 
 [package.metadata.docs.rs]
 all-features = true

core/Cargo.toml

@@ -7,6 +7,7 @@ description = "Core types for the littlefs2 crate"
 edition.workspace = true
 license.workspace = true
 repository.workspace = true
+rust-version.workspace = true
 
 [dependencies]
 bitflags = "2.6.0"