F: add cron example

examples/cron/.gitignore

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+build

examples/cron/Makefile

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+.PHONY: dev
+dev:
+	wrangler dev
+
+.PHONY: build
+build:
+	go run ../../cmd/workers-assets-gen
+	tinygo build -o ./build/app.wasm -target wasm ./...
+
+.PHONY: publish
+publish:
+	wrangler publish

examples/cron/README.md

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+# [Cron](https://developers.cloudflare.com/workers/platform/triggers/cron-triggers/)
+
+* Create a worker to be triggered by Cron.
+
+## Development
+
+### Requirements
+
+This project requires these tools to be installed globally.
+
+* wrangler
+* tinygo
+
+### Commands
+
+```
+make dev     # run dev server
+make build   # build Go Wasm binary
+make publish # publish worker
+```

examples/cron/go.mod

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+module github.com/syumai/workers/examples/scheduled
+
+go 1.18
+
+require github.com/syumai/workers v0.0.0
+
+replace github.com/syumai/workers => ../../

examples/cron/main.go

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+package main
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	"github.com/syumai/workers"
+	"github.com/syumai/workers/cloudflare"
+)
+
+func task(ctx context.Context, event workers.CronEvent) error {
+	fmt.Println(cloudflare.Getenv(ctx, "HELLO"))
+
+	if event.ScheduledTime.Minute()%2 == 0 {
+		return errors.New("even numbers cause errors")
+	}
+
+	return nil
+}
+
+func main() {
+	workers.ScheduleTask(task)
+}

examples/cron/wrangler.toml

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+name = "scheduled"
+main = "./build/worker.mjs"
+compatibility_date = "2023-02-24"
+workers_dev = false
+
+[vars]
+HELLO = "hello, world!"
+
+[triggers]
+crons = ["* * * * *"]
+
+[build]
+command = "make build"