CI workflow

.github/workflows/CI.yml

@@ -32,22 +32,54 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: 3.x
-      - name: Install Rust (rustup)
-        env:
-          SCCACHE_BUCKET: ${{ secrets.SCCACHE_BUCKET || '' }} # optional
+      - name: Cache Rust and sccache
+        uses: actions/cache@v4
+        with:
+          path: |
+            ${{ runner.temp }}/cargo
+            ${{ runner.temp }}/rustup
+            ~/.cache/pip
+            ~/.cache/pip-wheel
+            ~/.cache/sccache
+          key: rust-cache-${{ matrix.platform.target }}-${{ hashFiles('**/Cargo.lock') }}-${{ runner.os }}-${{ github.ref }}
+          restore-keys: |
+            rust-cache-${{ matrix.platform.target }}-${{ runner.os }}-
+            rust-cache-${{ runner.os }}-
+
+      - name: Install Rust (rustup) if needed
         run: |
+          set -e
+          export RUSTUP_HOME="${{ runner.temp }}/rustup"
+          export CARGO_HOME="${{ runner.temp }}/cargo"
+          export PATH="$CARGO_HOME/bin:$PATH"
+          if ! command -v rustc >/dev/null 2>&1; then
             curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
-          source $HOME/.cargo/env
+            source "$CARGO_HOME/env" 2>/dev/null || true
             rustup default nightly
             rustup target add x86_64-unknown-linux-gnu
-          cargo install sccache
+          fi
+          rustup target add "${{ matrix.platform.target }}" || true
+        shell: bash
+
+      - name: Install sccache and maturin
+        run: |
+          export RUSTUP_HOME="${{ runner.temp }}/rustup"
+          export CARGO_HOME="${{ runner.temp }}/cargo"
+          export PATH="$CARGO_HOME/bin:$PATH"
+          python -m pip install --upgrade pip
+          pip install maturin
+          if ! command -v sccache >/dev/null 2>&1; then
+            cargo install sccache || pip install sccache
+          fi
+        shell: bash
+
       - name: Build wheels
         run: |
           source $HOME/.cargo/env
           python -m pip install maturin
           maturin build --release --out dist --find-interpreter --target ${{ matrix.platform.target }}
       - name: Upload wheels
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@v3.2.2
         with:
           name: wheels-linux-${{ matrix.platform.target }}
           path: dist