Add comprehensive logs functionality with real-time streaming

[meap]

Summary

• Add new logs command for viewing ECS service logs from CloudWatch
• Implement real-time log streaming with -f/--follow flag
• Support for AWS partitions (aws, aws-cn, aws-us-gov) in log group ARN construction
• Automatic discovery of CloudWatch log groups and streams for ECS services

Key Features

• Basic log viewing: runecs logs --service cluster/service shows logs from the last hour
• Real-time streaming: runecs logs -f --service cluster/service provides live log tailing
• Multi-task support: Aggregates logs from all running tasks in a service
• Chronological ordering: Displays logs sorted by timestamp across all tasks
• AWS partition support: Works across different AWS partitions (standard, China, GovCloud)

Implementation Details

• New cmd/logs.go command with follow flag support
• Enhanced internal/ecs/logs.go with comprehensive logging functionality:
  • GetServiceLogs() for fetching historical logs
  • TailServiceLogs() for real-time streaming
  • TailLogGroups() for generic CloudWatch log group tailing
• Improved ARN handling with partition support in internal/ecs/arn.go
• Signal handling for graceful shutdown on Ctrl+C
• Robust error handling for missing log configurations

Test Plan

• Test basic log viewing for services with CloudWatch logging
• Test real-time log streaming with follow mode
• Test graceful shutdown with Ctrl+C
• Test with services having multiple running tasks
• Test error handling for services without CloudWatch logging
• Test AWS partition support across different regions

[Copilot]

Pull Request Overview

This PR adds comprehensive logging functionality to RunECS with real-time streaming capabilities, including a new logs command for viewing CloudWatch logs from ECS services and support for AWS partitions.

Key changes:

• Added new logs command with real-time streaming support via -f/--follow flag
• Implemented CloudWatch log group and stream discovery for ECS services
• Enhanced ARN handling with AWS partition support for multi-region compatibility

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
cmd/logs.go	New logs command implementation with follow mode and signal handling
internal/ecs/logs.go	Core logging functionality with service log retrieval and real-time tailing
internal/ecs/arn.go	New ARN utilities for partition extraction and ARN construction
internal/ecs/types.go	Added STS client and log stream prefix type definitions
internal/ecs/client.go	Added STS client initialization
internal/ecs/execute.go	Refactored to use new logging infrastructure with real-time streaming
internal/ecs/utils.go	Moved ARN extraction function to dedicated arn.go file
cmd/run.go	Refactored flag handling to use cobra's GetBool/GetString methods
cmd/deploy.go	Refactored flag handling to use cobra's GetBool/GetString methods
README.md	Updated documentation with logs command examples

Comments suppressed due to low confidence (1)

internal/ecs/logs.go:88

• The extractARNResource function returns two values (string, error), but only the error is being checked. The returned string value should be assigned to processID.

		processID, err := extractARNResource(taskArn)

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