add application controller (#2652)

Signed-off-by: Jeff <zw0948@gmail.com>

vendor/sigs.k8s.io/controller-runtime/.gitignore

@@ -0,0 +1,21 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# editor and IDE paraphernalia
+.idea
+*.swp
+*.swo
+*~
+
+# Vscode files
+.vscode