feat: specify msrv (#95)

.github/workflows/pr.yaml

@@ -43,4 +43,18 @@ jobs:
           shared-key: debug-build-nightly
       - name: Lint
         run: just lint "strict"
-
+  msrv-check:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - uses: taiki-e/install-action@v2
+        with:
+          tool: just, cargo-binstall
+      - run: echo "RUST_TOOLCHAIN=$(just rust-version)" >> $GITHUB_ENV
+      - uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: ${{ env.RUST_TOOLCHAIN }}
+          components: rustfmt, clippy
+      - run: |
+          cargo binstall cargo-msrv
+          just verify-msrv

Cargo.toml

@@ -6,6 +6,7 @@ repository = "https://github.com/moia-oss/tinytime.rs"
 documentation = "https://docs.rs/tinytime"
 edition = "2021"
 version = "0.12.7"
+rust-version = "1.81.0"
 license = "MIT OR Apache-2.0"
 
 [features]

justfile

@@ -8,13 +8,17 @@ set quiet
 
 rust_version         := `sed -nr 's/channel = "(.*)"/\1/p' rust-toolchain.toml`
 rust_nightly_version := `sed -nr 's/channel = "(.*)"/\1/p' rust-toolchain-nightly.toml`
+msrv                 := `sed -nr 's/rust-version = "(.*)"/\1/p' Cargo.toml`
 
 rust-version:
     echo '{{rust_version}}'
 
 rust-nightly-version:
     echo '{{rust_nightly_version}}'
 
+msrv:
+    echo '{{msrv}}'
+
 test:
 	cargo test --workspace --all-targets --all-features
 	cargo test --workspace --doc
@@ -38,4 +42,7 @@ udeps:
 	cargo '+{{rust_nightly_version}}' udeps
 
 install-nightly:
-	rustup toolchain install '{{rust_nightly_version}}'
+	rustup toolchain install '{{rust_nightly_version}}'
+
+verify-msrv:
+    cargo msrv verify --all-features --ignore-lockfile