feat(ci): add workflow dispatch for STA timing analysis CI

.github/workflows/sta.yml

@@ -0,0 +1,102 @@
+name: STA Nightly Regression
+
+on:
+  schedule:
+    # 12:00 UTC == 20:00 UTC+8
+    - cron: '00 12 * * *'
+  workflow_dispatch:
+  pull_request:
+
+jobs:
+  run-sta-xiangshan:
+    timeout-minutes: 2880
+    runs-on: [self-hosted, node]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Prepare XiangShan
+        run: |
+          cd $GITHUB_WORKSPACE/..
+          rm -rf XiangShan
+          proxychains git clone --single-branch --branch main --depth 1 https://github.com/OpenXiangShan/XiangShan.git
+          cd XiangShan && make init && rm -rf difftest && cp -r $GITHUB_WORKSPACE .
+          echo "NOOP_HOME=$(pwd)" >> $GITHUB_ENV
+          echo "DIFF_RTL_HOME=$(pwd)/difftest/build" >> $GITHUB_ENV
+
+      - name: Build XiangShan
+        run: |
+          cd $NOOP_HOME
+          make verilog DEBUG_ARGS="--difftest-config ESBIFDU --difftest-exclude Vec" FPGA=1 WITH_CHISELDB=0 WITH_CONSTANTIN=0 CONFIG=XSNoCDiffTopConfig -j10
+
+      - name: Build DiffTest
+        run: |
+          cd $NOOP_HOME/difftest
+          export NOOP_HOME=$(pwd)
+          make difftest_verilog PROFILE=../build/generated-src/difftest_profile.json NUMCORES=1 CONFIG=ESBIFDU  
+
+      - name: Run STA
+        run: |
+          export PATH=/nfs/home/share/tools/yosys:$PATH
+          export YOSYS_STA_DIR=/nfs/home/share/tools/yosys-sta
+          export ABC_THREADS=16
+          export YOSYS_TIMEOUT=12h
+          export ISTA_TIMEOUT=24h
+          export TIMEOUT_KILL_AFTER=10m
+          RUN_STA_TOTAL_TIMEOUT=40h
+          cd $NOOP_HOME/difftest
+          RUN_STA_LOG=./scripts/ieda/sta_results/run_sta.log
+          RUN_STA_STATUS=./scripts/ieda/sta_results/run_sta.status
+          # Keep STA output in file to avoid CI pipeline log-streaming side effects.
+          set +e
+          if ! command -v timeout >/dev/null 2>&1; then
+            echo "ERROR: timeout command not found on runner"
+            exit 2
+          fi
+          RUN_STA_LOG_TO_FILE=1 RUN_STA_LOG_CONSOLE=0 RUN_STA_LOG_FILE=$RUN_STA_LOG RUN_STA_STATUS_FILE=$RUN_STA_STATUS \
+            timeout --foreground --signal=TERM --kill-after=15m "$RUN_STA_TOTAL_TIMEOUT" \
+            bash ./scripts/ieda/run_sta.sh $DIFF_RTL_HOME GatewayEndpoint
+          EXIT_CODE=$?
+          set -e
+          echo "run_sta exit code: $EXIT_CODE"
+          # Print a compact summary to CI logs after completion.
+          if [ -f "$RUN_STA_STATUS" ]; then
+            echo "=== run_sta status markers (from $RUN_STA_STATUS) ==="
+            tail -n 100 "$RUN_STA_STATUS" || true
+          else
+            echo "WARNING: run_sta status file not found: $RUN_STA_STATUS"
+          fi
+          if [ -f "$RUN_STA_LOG" ]; then
+            echo "=== run_sta summary (from $RUN_STA_LOG) ==="
+            grep -E '(^Step|^===|^---|^Error:|^ERROR:|completed|saved|Results|ABC threads|yosys-sta|RTL directory|Clock|PDK|Netlist|Timing analysis|Critical path|Summary)' \
+              "$RUN_STA_LOG" | tail -n 200 || true
+          else
+            echo "WARNING: run_sta log not found: $RUN_STA_LOG"
+          fi
+          if [ "$EXIT_CODE" -ne 0 ] && [ -f "$RUN_STA_LOG" ]; then
+            echo "=== run_sta log tail (last 200 lines) ==="
+            tail -n 200 "$RUN_STA_LOG" || true
+          fi
+          if [ "$EXIT_CODE" -eq 124 ] || [ "$EXIT_CODE" -eq 137 ]; then
+            echo "ERROR: run_sta timeout reached (total=$RUN_STA_TOTAL_TIMEOUT, yosys=$YOSYS_TIMEOUT, ista=$ISTA_TIMEOUT)"
+          fi
+          # Keep original non-zero exit code from run_sta.sh (including timeout 124).
+          if [ "$EXIT_CODE" -ne 0 ]; then
+            exit $EXIT_CODE
+          fi
+          # Check output artifacts only when run_sta.sh completed successfully.
+          if [ ! -f "./scripts/ieda/sta_results/critical_paths.txt" ]; then
+            echo "ERROR: run_sta succeeded but critical_paths.txt not found"
+            exit 1
+          fi
+          exit $EXIT_CODE
+
+      - name: Print critical results
+        run: |
+          cd $NOOP_HOME/difftest
+          if [ -f "./scripts/ieda/sta_results/critical_paths.txt" ]; then
+            cat ./scripts/ieda/sta_results/critical_paths.txt
+          else
+            echo "ERROR: critical_paths.txt not found!"
+            exit 1
+          fi