add template for cron jobs creation (issue 49)

_templates/cloudflare/cron-go/.gitignore

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+build
+node_modules
+.wrangler

_templates/cloudflare/cron-go/Makefile

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+.PHONY: dev
+dev:
+	wrangler dev
+
+.PHONY: build
+build:
+	go run github.com/syumai/workers/cmd/workers-assets-gen@v0.23.1 -mode=go
+	GOOS=js GOARCH=wasm go build -o ./build/app.wasm .
+
+.PHONY: deploy
+deploy:
+	wrangler deploy

_templates/cloudflare/cron-go/README.md

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+# cron-job-template-go
+
+- A template for starting a Cloudflare Worker project with a cron job using Go.
+- This template uses the [workers](https://github.com/syumai/workers) package to schedule and run cron jobs.
+
+## Notice
+
+- A free plan Cloudflare Workers only accepts ~1MB sized workers.
+  - Go Wasm binaries easily exceed this limit, so _you'll need to use a paid plan of Cloudflare Workers_ (which accepts ~5MB sized workers).
+  - There's also a TinyGo version of this that can be found [here](https://github.com/syumai/workers/tree/main/_templates/cloudflare/cron-tinygo).
+
+## Usage
+
+- `main.go` includes a simple cron job implementation. Feel free to edit this code and implement your own cron job logic.
+
+## Requirements
+
+- Node.js
+- [wrangler](https://developers.cloudflare.com/workers/wrangler/)
+  - Just run `npm install -g wrangler`
+- Go 1.21.0 or later
+
+## Getting Started
+
+- If not already installed, please install the [gonew](https://pkg.go.dev/golang.org/x/tools/cmd/gonew) command.
+
+```console
+go install golang.org/x/tools/cmd/gonew@latest
+```
+
+- Create a new project using this template.
+  - The second argument passed to `gonew` is the module path of your new app.
+
+```console
+gonew github.com/syumai/workers/_templates/cloudflare/cron-go your.module/my-app # e.g. github.com/syumai/my-app
+cd my-app
+go mod tidy
+make dev # start running dev server
+```
+
+- To change the worker name, please edit the `name` property in `wrangler.toml`.
+
+## Development
+
+### Commands
+
+```console
+make dev     # run dev server
+make build   # build Go Wasm binary
+make deploy  # deploy worker
+```
+
+### Testing the Dev Server
+
+- To test the cron job, you can simulate the cron event by sending an HTTP request to the dev server.
+
+```console
+curl -X POST http://localhost:8787/cron
+```
+
+- You should see the scheduled time printed in the console.

_templates/cloudflare/cron-go/go.mod

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+module github.com/syumai/workers/_templates/cloudflare/cron-go
+
+go 1.21.3
+
+toolchain go1.22.4
+
+require github.com/syumai/workers v0.26.1

_templates/cloudflare/cron-go/go.sum

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+github.com/syumai/workers v0.26.1 h1:DvhLZ4PPO/zu5leYRd85TnHELOBTkBbi/2ymkLOieSY=
+github.com/syumai/workers v0.26.1/go.mod h1:ZnqmdiHNBrbxOLrZ/HJ5jzHy6af9cmiNZk10R9NrIEA=

_templates/cloudflare/cron-go/main.go

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+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/syumai/workers/cloudflare/cron"
+)
+
+func task(ctx context.Context) error {
+	e, err := cron.NewEvent(ctx)
+	if err != nil {
+		return fmt.Errorf("failed to create cron event: %w", err)
+	}
+	log.Printf("Cron job triggered at: %s", time.Unix(e.ScheduledTime.Unix(), 0).Format(time.RFC3339))
+	log.Println("Executing scheduled task...")
+	return nil
+}
+
+func main() {
+	cron.ScheduleTask(task)
+	select {}
+}

_templates/cloudflare/cron-go/wrangler.toml

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+name = "go-cron"
+main = "./build/worker.mjs"
+compatibility_date = "2023-02-24"
+workers_dev = false
+
+[triggers]
+crons = ["* * * * *"]
+
+[build]
+command = "make build"

_templates/cloudflare/cron-tinygo/.gitignore

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+build
+node_modules
+.wrangler

_templates/cloudflare/cron-tinygo/Makefile

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+.PHONY: dev
+dev:
+	wrangler dev
+
+.PHONY: build
+build:
+	go run github.com/syumai/workers/cmd/workers-assets-gen@v0.23.1
+	tinygo build -o ./build/app.wasm -target wasm -no-debug ./...
+
+.PHONY: deploy
+deploy:
+	wrangler deploy

_templates/cloudflare/cron-tinygo/README.md

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+# cron-tinygo
+
+- A template for starting a Cloudflare Worker project with a cron job using Go.
+- This template uses the [workers](https://github.com/syumai/workers) package to schedule and run cron jobs.
+
+## Notice
+
+- A free plan Cloudflare Workers only accepts ~1MB sized workers.
+  - TinyGo Wasm binaries probably won't exceed this limit, so you might not need to use a paid plan of Cloudflare Workers.
+  - There's also a Go version of this that can be found [here](https://github.com/syumai/workers/tree/main/_templates/cloudflare/cron-go).
+
+## Usage
+
+- `main.go` includes a simple cron job implementation. Feel free to edit this code and implement your own cron job logic.
+
+## Requirements
+
+- Node.js
+- [wrangler](https://developers.cloudflare.com/workers/wrangler/)
+  - Just run `npm install -g wrangler`
+- Go 1.21.0 or later
+
+## Getting Started
+
+- If not already installed, please install the [gonew](https://pkg.go.dev/golang.org/x/tools/cmd/gonew) command.
+
+```console
+go install golang.org/x/tools/cmd/gonew@latest
+```
+
+- Create a new project using this template.
+  - The second argument passed to `gonew` is the module path of your new app.
+
+```console
+gonew github.com/syumai/workers/_templates/cloudflare/cron-go your.module/my-app # e.g. github.com/syumai/my-app
+cd my-app
+go mod tidy
+make dev # start running dev server
+```
+
+- To change the worker name, please edit the `name` property in `wrangler.toml`.
+
+## Development
+
+### Commands
+
+```console
+make dev     # run dev server
+make build   # build Go Wasm binary
+make deploy  # deploy worker
+```
+
+### Testing the Dev Server
+
+- To test the cron job, you can simulate the cron event by sending an HTTP request to the dev server.
+
+```console
+curl -X POST http://localhost:8787/cron
+```
+
+- You should see the scheduled time printed in the console.

_templates/cloudflare/cron-tinygo/go.mod

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+module github.com/syumai/workers/_templates/cloudflare/cron-tinygo
+
+go 1.21.3
+
+toolchain go1.22.4
+
+require github.com/syumai/workers v0.26.1

_templates/cloudflare/cron-tinygo/go.sum

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+github.com/syumai/workers v0.26.1 h1:DvhLZ4PPO/zu5leYRd85TnHELOBTkBbi/2ymkLOieSY=
+github.com/syumai/workers v0.26.1/go.mod h1:ZnqmdiHNBrbxOLrZ/HJ5jzHy6af9cmiNZk10R9NrIEA=

_templates/cloudflare/cron-tinygo/main.go

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+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"time"
+
+	"github.com/syumai/workers/cloudflare/cron"
+)
+
+func task(ctx context.Context) error {
+	e, err := cron.NewEvent(ctx)
+	if err != nil {
+		return fmt.Errorf("failed to create cron event: %w", err)
+	}
+	log.Printf("Cron job triggered at: %s", time.Unix(e.ScheduledTime.Unix(), 0).Format(time.RFC3339))
+	log.Println("Executing scheduled task...")
+	return nil
+}
+
+func main() {
+	cron.ScheduleTask(task)
+	select {}
+}

_templates/cloudflare/cron-tinygo/wrangler.toml

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+name = "tinygo-cron"
+main = "./build/worker.mjs"
+compatibility_date = "2023-02-24"
+workers_dev = false
+
+[triggers]
+crons = ["* * * * *"]
+
+[build]
+command = "make build"