use singelton for compiler

Signed-off-by: FogDong <dongtianxin.tx@alibaba-inc.com>

go.mod

@@ -7,7 +7,6 @@ require (
 	github.com/agiledragon/gomonkey/v2 v2.4.0
 	github.com/aliyun/aliyun-log-go-sdk v0.1.38
 	github.com/crossplane/crossplane-runtime v0.19.2
-	github.com/cue-exp/kubevelafix v0.0.0-20220922150317-aead819d979d
 	github.com/evanphx/json-patch v5.6.0+incompatible
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da
 	github.com/google/go-cmp v0.5.9

go.sum

@@ -86,8 +86,6 @@ github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46t
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/crossplane/crossplane-runtime v0.19.2 h1:9qBnhpqKN4x6apF2siaQ6PvgxqBXbGcKmgeD8mSIDO8=
 github.com/crossplane/crossplane-runtime v0.19.2/go.mod h1:OJQ1NxtQK2ZTRmvtnQPoy8LsXsARTnVydRVDQEgIuz4=
-github.com/cue-exp/kubevelafix v0.0.0-20220922150317-aead819d979d h1:VNJA1nSKA8Xna5wjUIMItHlWmEej8Bb9fZ3vCNtIAX0=
-github.com/cue-exp/kubevelafix v0.0.0-20220922150317-aead819d979d/go.mod h1:SyTryzw/zYJIogw3H2IRcYdV5gsSoVMJiKGElcQK09I=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=

pkg/cue/README.md

@@ -7,4 +7,3 @@ The following packages need to be tested without external/tool dependencies, So
 - github.com/kubevela/workflow/pkg/cue/model/sets
 - github.com/kubevela/workflow/pkg/cue/process
 - github.com/kubevela/workflow/pkg/cue/task
-- github.com/kubevela/workflow/pkg/cue/packages