Add automatic trigger module - cron, complete testing and integration.

L1/dockerfiles/cron/Dockerfile

+FROM golang:1.20.3
+
+ARG GOPROXY=https://goproxy.cn
+
+COPY . /src/
+RUN --mount=type=cache,target=/go/pkg \
+    cd /src && go build main.go && strip main
+
+FROM hub.cstcloud.cn/scalebox/agent
+
+COPY --from=0 /src/main /app/bin/cron
+
+ENV ACTION_RUN=/app/bin/cron
+
+ENTRYPOINT ["goagent"]

L1/dockerfiles/cron/Makefile

+IMAGE_NAME:=hub.cstcloud.cn/scalebox/cron
+
+build:
+	DOCKER_BUILDKIT=1 docker build --network=host -t $(IMAGE_NAME) .
+
+push:
+	docker push $(IMAGE_NAME)
+
+clean:
+	docker rmi $(IMAGE_NAME)
+
+run:
+	scalebox app create

L1/dockerfiles/cron/README.md

+# cron module
+
+## Introduction
+The cron module is a scalebox public module similar to the cron function under UNIX, which periodically sends messages to each sub-module to start related timing operations.
+
+## Usage
+
+Define timing operations for multiple modules through the file cron.txt.
+
+In the cron.txt file, lines beginning with '#' are comment lines.
+
+Each line defines the timing operation for a module, including timing operation interval definition and module name, separated by commas.
+
+A sample cron.txt file is as follows:
+```
+# comments for cron.txt
+@every 1m,mod0
+@every 1m30s,mod1
+```
+
+The definition part of the timing operation interval refers to:
+[cron-doc](https://pkg.go.dev/github.com/robfig/cron)
+

L1/dockerfiles/cron/app.yaml

+name: cron.scalebox
+cluster: local
+parameters:
+  initial_status: RUNNING
+
+jobs:
+  filelist:
+    base_image: hub.cstcloud.cn/scalebox/cron
+    schedule_mode: HEAD
+    parameters:
+      start_message: ANY
+    paths:
+      - ${PWD}/cron.txt:/cron.txt:ro
+    sink_jobs:
+      - mod0
+      - mod1
+
+  mod0:
+    base_image: hub.cstcloud.cn/scalebox/agent
+  mod1:
+    base_image: hub.cstcloud.cn/scalebox/agent

L1/dockerfiles/cron/cron.txt

+# comments
+@every 1m,redis-cli
+# @every 1m30s,mod1
\ No newline at end of file

L1/dockerfiles/cron/go.mod

+module cron
+
+go 1.19
+
+require github.com/robfig/cron/v3 v3.0.1

L1/dockerfiles/cron/go.sum

+github.com/robfig/cron/v3 v3.0.1 h1:WdRxkvbJztn8LMz/QEvLN5sBU+xKpSqwwUO1Pjr4qDs=
+github.com/robfig/cron/v3 v3.0.1/go.mod h1:eQICP3HwyT7UooqI/z+Ov+PtYAWygg1TEWWzGIFLtro=

L1/dockerfiles/cron/main.go

+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+	"time"
+
+	"github.com/robfig/cron/v3"
+)
+
+type cronItem struct {
+	cronText string
+	modName  string
+}
+
+func main() {
+	var cronItems []cronItem
+
+	file, err := os.Open("/cron.txt")
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Open file error:%v", err)
+		os.Exit(1)
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		s := strings.TrimSpace(scanner.Text())
+		if len(s) > 0 && s[0] != '#' { // not comment
+			ss := strings.Split(s, ",")
+			if len(ss) != 2 {
+				fmt.Fprintf(os.Stderr, "format error: %s\n", s)
+				continue
+			}
+			cronItems = append(cronItems, cronItem{cronText: ss[0], modName: ss[1]})
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		fmt.Fprintf(os.Stderr, "scan file error:%v", err)
+		os.Exit(2)
+	}
+
+	c := cron.New()
+
+	for _, item := range cronItems {
+		// CAUTION: local variable needed
+		modName := item.modName
+		c.AddFunc(item.cronText, func() {
+			current := time.Now().Format("2006-01-02T15:04:05")
+			cmd := exec.Command("send-job-message", modName, current)
+			output, err := cmd.CombinedOutput()
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "send-job-message error:%v", err)
+			}
+			fmt.Println(string(output))
+		})
+	}
+
+	c.Start()
+	// block main goroutine
+	ch := make(chan struct{})
+	<-ch
+}