test: add test script for coverity scan report

tests/perftest-scripts/coverity_scan.sh

+#!/bin/bash
+
+# follow link: https://scan.coverity.com/download
+
+workdir=/root
+token="replace_with_coverity_scan_token"
+
+
+cd $workdir/TDengine
+
+git reset --hard HEAD
+git checkout -- .
+git checkout develop
+git pull
+git submodule update --init --recursive
+
+mkdir -p debug
+cd debug
+rm -rf *
+cmake .. -DBUILD_TOOLS=true
+cov-build --dir cov-int make -j 4
+tar czvf TDengine.tgz cov-int
+curl --form token=$token \
+	--form email="support@taosdata.com" \
+	--form file=@TDengine.tgz \
+	--form version="2.4.0.0" \
+	--form description="TDengine Test" \
+	https://scan.coverity.com/builds?project=tdengine