ci(repo): use working-directory for baseline worktree steps

pnpm 10 mishandles `pnpm --dir <path> <non-builtin> ...`, treating the
path as the command to execute and erroring with
ERR_PNPM_RECURSIVE_EXEC_FIRST_FAIL. Switching the worktree-fallback
install/build/snapshot steps to GHA's `working-directory:` avoids the
flag entirely.

Author: jacekradko

.github/workflows/api-changes.yml

@@ -134,16 +134,19 @@ jobs:
 
       - name: Install baseline dependencies
         if: steps.baseline-cache.outputs.cache-matched-key == ''
-        run: pnpm --dir .worktrees/snapi-baseline install --frozen-lockfile
+        working-directory: .worktrees/snapi-baseline
+        run: pnpm install --frozen-lockfile
 
       - name: Build baseline declarations
         if: steps.baseline-cache.outputs.cache-matched-key == ''
-        run: pnpm --dir .worktrees/snapi-baseline turbo build:declarations $TURBO_ARGS $SNAPI_FILTERS
+        working-directory: .worktrees/snapi-baseline
+        run: pnpm turbo build:declarations $TURBO_ARGS $SNAPI_FILTERS
 
       - name: Generate baseline API snapshots
         if: steps.baseline-cache.outputs.cache-matched-key == ''
+        working-directory: .worktrees/snapi-baseline
         run: |
-          pnpm --dir .worktrees/snapi-baseline dlx --package "$SNAPI_PACKAGE" snapi snapshot \
+          pnpm dlx --package "$SNAPI_PACKAGE" snapi snapshot \
             --output "$GITHUB_WORKSPACE/.api-snapshots-baseline"
 
       - name: Detect API changes