ci: update rust pre-merge checks (#97)

.github/workflows/pre-merge-rust.yml

+# SPDX-FileCopyrightText: Copyright (c) 2024-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Rust pre-merge checks
+
+on:
+  # Always run this workflow when commits are pushed to main.
+  push:
+    branches:
+    - main
+
+  # Run this workflow on pull requests targeting main but only if files in runtime/rust change.
+  pull_request:
+    branches:
+    - main
+    paths:
+    - 'runtime/rust/**'
+
+jobs:
+  pre-merge-rust:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up system dependencies
+      run: |
+        sudo apt-get update -y
+        sudo apt-get install -y protobuf-compiler
+    - name: Cache Cargo Registry
+      uses: actions/cache@v3
+      with:
+        path: ~/.cargo/registry
+        key: ${{ runner.os }}-cargo-registry-${{ github.head_ref || github.ref_name }}-${{ hashFiles('**/Cargo.lock') }}
+    - name: Set up Rust Toolchain Components
+      run: rustup component add rustfmt clippy
+    - name: Run Cargo Check
+      working-directory: runtime/rust
+      run: cargo check --locked
+    - name: Verify Code Formatting
+      working-directory: runtime/rust
+      run: cargo fmt -- --check
+    - name: Run Clippy Checks
+      working-directory: runtime/rust
+      run: cargo clippy --no-deps --all-targets -- -D warnings
+    - name: Run Unit Tests
+      working-directory: runtime/rust
+      run: cargo test --locked --all-targets
\ No newline at end of file

.github/workflows/pre-merge.yml

@@ -88,38 +88,3 @@ jobs:
   #   - run: ./icp/protos/gen_python.sh
   #   - run: pytest -p no:warnings --verbose worker/python/tests
   #     timeout-minutes: 2
-
-  pre-merge-rust:
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-    steps:
-    - uses: actions/checkout@v4
-    - name: Set up system dependencies
-      run: |
-        sudo apt-get update -y
-        sudo apt-get install -y protobuf-compiler
-    - name: Cache Cargo Registry
-      uses: actions/cache@v3
-      with:
-        path: ~/.cargo/registry
-        key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
-    - name: Cache Cargo Target Directory
-      uses: actions/cache@v3
-      with:
-        path: runtime/rust/target
-        key: ${{ runner.os }}-cargo-target-${{ hashFiles('**/Cargo.lock') }}
-    - name: Set up Rust Toolchain Components
-      run: rustup component add rustfmt clippy
-    - name: Run Cargo Check
-      working-directory: runtime/rust
-      run: cargo check --locked
-    - name: Verify Code Formatting
-      working-directory: runtime/rust
-      run: cargo fmt -- --check
-    - name: Run Clippy Checks
-      working-directory: runtime/rust
-      run: cargo clippy --no-deps --all-targets -- -D warnings
-    - name: Run Unit Tests
-      working-directory: runtime/rust
-      run: cargo test --locked --all-targets
\ No newline at end of file