Add MSRV check as a GA job (#7123)

* Add MSRV check for GA.

* Add comment.

.github/workflows/rust.yml

@@ -558,3 +558,28 @@ jobs:
           # If you encounter an error, run './dev/update_config_docs.sh' and commit
           ./dev/update_config_docs.sh
           git diff --exit-code
+
+  # Verify MSRV for the crates which are directly used by other projects.
+  msrv:
+    name: Verify MSRV
+    runs-on: ubuntu-latest
+    container:
+      image: amd64/rust
+    steps:
+      - uses: actions/checkout@v3
+      - name: Setup Rust toolchain
+        uses: ./.github/actions/setup-builder
+      - name: Install cargo-msrv
+        run: cargo install cargo-msrv
+      - name: Check datafusion
+        working-directory: datafusion/core
+        run: cargo msrv verify
+      - name: Check datafusion-substrait
+        working-directory: datafusion/substrait
+        run: cargo msrv verify
+      - name: Check datafusion-proto
+        working-directory: datafusion/proto
+        run: cargo msrv verify
+      - name: Check datafusion-cli
+        working-directory: datafusion-cli
+        run: cargo msrv verify

datafusion/core/Cargo.toml

@@ -27,7 +27,7 @@ homepage = { workspace = true }
 repository = { workspace = true }
 license = { workspace = true }
 authors = { workspace = true }
-rust-version = { workspace = true }
+rust-version = "1.70"
 
 [lib]
 name = "datafusion"

datafusion/proto/Cargo.toml

@@ -26,7 +26,7 @@ homepage = { workspace = true }
 repository = { workspace = true }
 license = { workspace = true }
 authors = { workspace = true }
-rust-version = { workspace = true }
+rust-version = "1.70"
 
 # Exclude proto files so crates.io consumers don't need protoc
 exclude = ["*.proto"]

datafusion/substrait/Cargo.toml

@@ -25,7 +25,7 @@ homepage = { workspace = true }
 repository = { workspace = true }
 license = { workspace = true }
 authors = { workspace = true }
-rust-version = { workspace = true }
+rust-version = "1.70"
 
 [dependencies]
 async-recursion = "1.0"