chore: parallel unit test CI prototype

.github/workflows/presubmit.yaml

@@ -18,6 +18,14 @@ jobs:
       - uses: pnpm/action-setup@v4
         with:
           version: ^10.0.0
+      - name: Cache turbo build setup
+        uses: actions/cache@v4
+        with:
+          path: .turbo
+          key: ${{ runner.os }}-turbo-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-turbo-
+      - uses: oven-sh/setup-bun@v2
       - run: node --version
       - run: ci/run_conditional_tests.sh
         name: Run unit tests

.github/workflows/windows-presubmit.yaml

@@ -18,10 +18,32 @@ jobs:
       - uses: pnpm/action-setup@v4
         with:
           version: ^10.0.0
+      - name: Cache turbo build setup
+        uses: actions/cache@v4
+        with:
+          path: .turbo
+          key: ${{ runner.os }}-turbo-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-turbo-
+      - uses: oven-sh/setup-bun@v2
+      - name: Update Windows path to use Linux/MacOS compatible binaries from Git Bash
+        run: echo "C:\Program Files\Git\usr\bin" >> $GITHUB_PATH
+        shell: bash
+      - name: Check which cp is being used
+        run: where cp
+        shell: cmd
       - run: node --version
+      - name: Force NPM to use Git Bash
+        run: |
+          npm config set script-shell "C:\\Program Files\\Git\\bin\\bash.exe"
+          pnpm config set script-shell "C:\\Program Files\\Git\\bin\\bash.exe"
+        shell: cmd
       - run: bash ci/run_conditional_tests.sh
         name: Run windows unit tests
         shell: bash
         env:
           BUILD_TYPE: presubmit
           TEST_TYPE: units
+          TURBO_TELEMETRY_DISABLED: 1
+          SHELL: C:\Program Files\Git\bin\bash.exe
+          npm_config_script_shell: "C:\\Program Files\\Git\\bin\\bash.exe"

.gitignore

@@ -2,6 +2,8 @@
 **/node_modules
 .coverage
 .nyc_output
+.turbo
+*.tsbuildinfo
 docs/json
 packages/google-cloud/README.md
 packages/*/AUTHORS