Add static code analysis to CI test (#1197)

hack/verify-staticcheck.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+ROOT=`realpath $(dirname $0)/..`
+
+# Currently here only lists the packages that already addressed all warnings for gradual code repair.
+# That means we don't allow adding new warnings to any of package in list. And eventually, the
+# list will be replaced by find command.
+declare -a pkgs=("pkg/builder" "pkg/builder" "pkg/crd" "pkg/logger" "pkg/buildermgr" "pkg/fission-cli" "cmd/fission-cli")
+
+for pkg in "${pkgs[@]}"
+do
+    find ${ROOT}/${pkg} -type d |grep -v influxdb | xargs -I@ staticcheck @
+done