[codex-rs] CI performance for rust (#639)

* Refactors the rust-ci into a matrix build
* Adds directory caching for the build artifacts
* Adds workflow dispatch for manual testing

.github/workflows/rust-ci.yml

@@ -9,79 +9,77 @@ on:
     branches:
       - main
 
+  workflow_dispatch:
+
 # For CI, we build in debug (`--profile dev`) rather than release mode so we
 # get signal faster.
 
 jobs:
-  macos:
-    runs-on: macos-14
-    timeout-minutes: 30
-    defaults:
-      run:
-        working-directory: codex-rs
-    steps:
-      - uses: actions/checkout@v4
-      - uses: dtolnay/rust-toolchain@stable
-        with:
-          targets: aarch64-apple-darwin,x86_64-apple-darwin
-
-      - name: Initialize failure flag
-        run: echo "FAILED=" >> $GITHUB_ENV
-
-      - name: cargo fmt
-        run: cargo fmt -- --config imports_granularity=Item --check || echo "FAILED=${FAILED:+$FAILED, }cargo fmt" >> $GITHUB_ENV
-
-      - name: cargo test
-        run: RUST_BACKTRACE=full cargo test || echo "FAILED=${FAILED:+$FAILED, }cargo test" >> $GITHUB_ENV
-
-      - name: cargo clippy
-        run: cargo clippy --all-features -- -D warnings || echo "FAILED=${FAILED:+$FAILED, }cargo clippy" >> $GITHUB_ENV
-
-      - name: arm64 build
-        run: cargo build --target aarch64-apple-darwin || echo "FAILED=${FAILED:+$FAILED, }arm64 build" >> $GITHUB_ENV
-
-      - name: x86_64 build
-        run: cargo build --target x86_64-apple-darwin || echo "FAILED=${FAILED:+$FAILED, }x86_64 build" >> $GITHUB_ENV
-
-      - name: Fail if any step failed
-        run: |
-          if [ -n "$FAILED" ]; then
-            echo -e "See logs above, as the following steps failed:\n$FAILED"
-            exit 1
-          fi
-        env:
-          FAILED: ${{ env.FAILED }}
-
-  linux-musl-x86_64:
+  # CI that don't need specific targets
+  general:
+    name: Format / etc
     runs-on: ubuntu-24.04
+    defaults:
+      run:
+        working-directory: codex-rs
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - name: cargo fmt
+        run: cargo fmt -- --config imports_granularity=Item --check
+
+  # CI to validate on different os/targets
+  lint_build_test:
+    name: ${{ matrix.runner }} - ${{ matrix.target }}
+    runs-on: ${{ matrix.runner }}
     timeout-minutes: 30
     defaults:
       run:
         working-directory: codex-rs
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - runner: macos-14
+            target: aarch64-apple-darwin
+          - runner: macos-14
+            target: x86_64-apple-darwin
+          - runner: ubuntu-24.04
+            target: x86_64-unknown-linux-musl
+          - runner: ubuntu-24.04
+            target: x86_64-unknown-linux-gnu
+
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/rust-toolchain@stable
         with:
-          targets: x86_64-unknown-linux-musl
-      - name: Install musl build tools
+          targets: ${{ matrix.target }}
+
+      - uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            ${{ github.workspace }}/codex-rs/target/
+          key: cargo-${{ matrix.runner }}-${{ matrix.target }}-${{ hashFiles('**/Cargo.lock') }}
+
+      - if: ${{ matrix.target == 'x86_64-unknown-linux-musl' }}
+        name: Install musl build tools
         run: |
-          sudo apt update
           sudo apt install -y musl-tools pkg-config
 
       - name: Initialize failure flag
         run: echo "FAILED=" >> $GITHUB_ENV
 
-      - name: cargo fmt
-        run: cargo fmt -- --config imports_granularity=Item --check || echo "FAILED=${FAILED:+$FAILED, }cargo fmt" >> $GITHUB_ENV
+      - name: cargo clippy
+        run: cargo clippy --target ${{ matrix.target }} --all-features -- -D warnings || echo "FAILED=${FAILED:+$FAILED, }cargo clippy" >> $GITHUB_ENV
 
       - name: cargo test
-        run: RUST_BACKTRACE=full cargo test || echo "FAILED=${FAILED:+$FAILED, }cargo test" >> $GITHUB_ENV
-
-      - name: cargo clippy
-        run: cargo clippy --all-features -- -D warnings || echo "FAILED=${FAILED:+$FAILED, }cargo clippy" >> $GITHUB_ENV
-
-      - name: x86_64 musl build
-        run: cargo build --target x86_64-unknown-linux-musl || echo "FAILED=${FAILED:+$FAILED, }x86_64 musl build" >> $GITHUB_ENV
+        run: cargo test --target ${{ matrix.target }} || echo "FAILED=${FAILED:+$FAILED, }cargo test" >> $GITHUB_ENV
 
       - name: Fail if any step failed
         run: |