ci: retry \ut install\ up to 3 times for transient SIGPIPE (141)

\`ut install --from pnpm\` intermittently exits with 141 (SIGPIPE)
right after printing the workspace summary — observed on typecheck
and on cnpmcore E2E in the same workflow run while other ubuntu jobs
(\`Test bin\`, \`Test scripts\`, \`Test\`) using the identical command
succeed. Wrap every install invocation in a 3-attempt retry with a
5s / 10s backoff so the workflow absorbs the flake while the upstream
utoo bug is investigated.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: killagu

.github/workflows/ci.yml

@@ -37,7 +37,8 @@ jobs:
           node-version: '24'
 
       - name: Install dependencies
-        run: ut install --from pnpm
+        # Retry to absorb transient `exit 141` (SIGPIPE) from `ut install`.
+        run: ut install --from pnpm || (sleep 5 && ut install --from pnpm) || (sleep 10 && ut install --from pnpm)
 
       - name: Run lint
         run: ut run lint
@@ -160,7 +161,7 @@ jobs:
           node-version: ${{ matrix.node }}
 
       - name: Install dependencies
-        run: ut install --from pnpm
+        run: ut install --from pnpm || (sleep 5 && ut install --from pnpm) || (sleep 10 && ut install --from pnpm)
 
       - name: Run tests
         run: ut run ci
@@ -204,7 +205,7 @@ jobs:
           node-version: ${{ matrix.node }}
 
       - name: Install dependencies
-        run: ut install --from pnpm
+        run: ut install --from pnpm || (sleep 5 && ut install --from pnpm) || (sleep 10 && ut install --from pnpm)
 
       - name: Run tests
         run: |
@@ -245,7 +246,7 @@ jobs:
           node-version: ${{ matrix.node }}
 
       - name: Install dependencies
-        run: ut install --from pnpm
+        run: ut install --from pnpm || (sleep 5 && ut install --from pnpm) || (sleep 10 && ut install --from pnpm)
 
       - name: Run tests
         run: |

.github/workflows/e2e-test.yml

@@ -150,7 +150,7 @@ jobs:
           node-version: ${{ matrix.project.node-version }}
 
       - name: Install dependencies
-        run: ut install --from pnpm
+        run: ut install --from pnpm || (sleep 5 && ut install --from pnpm) || (sleep 10 && ut install --from pnpm)
 
       - name: Build all packages
         run: ut run build