opengauss exporter deployment

[leo001]

### github
The default make file behavior is to build the binary:
```
$ go get github.com/enmotech/opengauss_exporter
$ cd ${GOPATH-$HOME/go}/src/github.com/enmotech/opengauss_exporter
$ make build
$ export DATA_SOURCE_NAME="postgresql://login:password@hostname:port/dbname"
$ ​​./bin/opengauss_exporter <flags>
```
 
### gitee
The default make file behavior is to build the binary:
`` `
[root@node1 opengauss_exporter]# pwd
/root/go/src/gitee.com/enmotech/opengauss_exporter
[root@node1 opengauss_exporter]# make build
▶ cleaning
▶ running gofmt
go: gitee.com/opengauss/openGauss-connector-go-pq@v1.0.0: Get https://proxy.golang.org/gitee.com/opengauss/open%21gauss-connector-go-pq/@v/ v1.0.0.mod: dial tcp 216.58.200.241:443: i/o timeout
make: *** [Makefile:80: fmt] Error 1
[root@node1 opengauss_exporter]#