* chore: apply release mode for the Dockerfile
* docs: update by `./bin/go-gin-petstore-server.sh`
* docs: update by `./bin/openapi3/go-gin-petstore-server.sh`
* copy from go-server and add go-gin-server generator
* change the templates for the gin
* fix warnings of the golint tool
* fix the path of script
* add samples
* delete unnecessary comments (#1048)
* make the help message more appropriate (#1048)
* fix the link address format (#1048)
* minor improvement