fix(ci): show pre-commit output easily on failure (#3985)

Right now, the failed Step which is opened by GH by default tells me to
just go up and click and scroll through for no reason.

.github/workflows/pre-commit.yml

@@ -50,19 +50,34 @@ jobs:
         run: npm ci
         working-directory: src/llama_stack/ui
 
+      - name: Install pre-commit
+        run: python -m pip install pre-commit
+
+      - name: Cache pre-commit
+        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
+        with:
+          path: ~/.cache/pre-commit
+          key: pre-commit-3|${{ env.pythonLocation }}|${{ hashFiles('.pre-commit-config.yaml') }}
+
       - name: Run pre-commit
         id: precommit
-        uses: pre-commit/action@2c7b3805fd2a0fd8c1884dcaebf91fc102a13ecd # v3.0.1
-        continue-on-error: true
+        run: |
+          set +e
+          pre-commit run --show-diff-on-failure --color=always --all-files 2>&1 | tee /tmp/precommit.log
+          status=${PIPESTATUS[0]}
+          echo "status=$status" >> $GITHUB_OUTPUT
+          exit 0
         env:
           SKIP: no-commit-to-branch,mypy
           RUFF_OUTPUT_FORMAT: github
 
       - name: Check pre-commit results
-        if: steps.precommit.outcome == 'failure'
+        if: steps.precommit.outputs.status != '0'
         run: |
           echo "::error::Pre-commit hooks failed. Please run 'pre-commit run --all-files' locally and commit the fixes."
-          echo "::warning::Some pre-commit hooks failed. Check the output above for details."
+          echo ""
+          echo "Failed hooks output:"
+          cat /tmp/precommit.log
           exit 1
 
       - name: Debug