探测url的ssl证书过期时间 并发微信告警

## build on arm64
```bash
cd /root
rm -rf remoteMonitor
git clone https://git.sre.ink/go/remoteMonitor.git
cd remoteMonitor
CGO_ENABLED=0 GOOS=linux GOARCH=arm64 GO111MODULE=on  go get github.com/shirou/gopsutil/v3/cpu@v3.21.12
CGO_ENABLED=0 GOOS=linux GOARCH=arm64 GO111MODULE=on  go get github.com/shirou/gopsutil/v3/disk@v3.21.12
CGO_ENABLED=0 GOOS=linux GOARCH=arm64 GO111MODULE=on  go mod tidy
CGO_ENABLED=0 GOOS=linux GOARCH=arm64 GO111MODULE=on  go build -v -a -o rtm main.go
chmod +x rtm
rm -rf /usr/bin/rtm
mv rtm /usr/bin/
rtm
```
## build amd64 oracle
```bash
cd /root
rm -rf remoteMonitor
git clone https://git.sre.ink/go/remoteMonitor.git
cd remoteMonitor
go get github.com/shirou/gopsutil/v3/cpu@v3.21.12
go get github.com/shirou/gopsutil/v3/disk@v3.21.12
CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=on  go build -v -a -o rtm main.go
chmod +x rtm
/bin/cp -arf rtm /usr/bin/rtm
/usr/bin/rtm
```


## build amd64 cn
```bash
cd /root
rm -rf remoteMonitor
git clone https://git.sre.ink/go/remoteMonitor.git
cd remoteMonitor
GOPROXY="https://goproxy.cn,direct" go get github.com/shirou/gopsutil/v3/cpu@v3.21.12
GOPROXY="https://goproxy.cn,direct" go get github.com/shirou/gopsutil/v3/disk@v3.21.12
CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GO111MODULE=on GOPROXY="https://goproxy.cn,direct" go build -v -a -o rtm main.go
chmod +x rtm
rm -rf /usr/bin/rtm
mv rtm /usr/bin/
```


## crontab
```bash
*/1 * * * * /usr/bin/rtm
```

## usage
```bash
chmod +x /usr/bin/rtm
rtm
```

## build for arm64
```bash
CGO_ENABLED=0 GOARM=7 GOOS=linux GOARCH=arm64 GO111MODULE=on GOPROXY="https://goproxy.cn,direct" go build -v -a -o certmonitor main.go
```