Feat/update comment

[yuyaban]

Description

Two functions have been added.

• When UpdateCondition is in effect in the post function, a special variable called target is added to the metadata to identify the comment to be updated.
  • When using the same template for several different jobs, the target variable can be used to avoid duplicate comments to be updated.
• Add UpdateCondition to the exec function as well, similar to post

Test Case

Post

$ HELLO=test1 go run ./cmd/github-comment post --org yuyaban --repo github-comment --pr 1 -k hello -u 'Comment.HasMeta && Comment.Meta.TemplateKey == "hello"' --var target:"JOB_A"
$ HELLO=test2 go run ./cmd/github-comment post --org yuyaban --repo github-comment --pr 1 -k hello -u 'Comment.HasMeta && Comment.Meta.TemplateKey == "hello"' --var target:"JOB_A"
$ HELLO=test1 go run ./cmd/github-comment post --org yuyaban --repo github-comment --pr 1 -k hello -u 'Comment.HasMeta && Comment.Meta.TemplateKey == "hello"' --var target:"JOB_B"

Exec

$ go run ./cmd/github-comment exec --org yuyaban --repo github-comment --pr 1 -k hello -u 'Comment.HasMeta && Comment.Meta.TemplateKey == "hello"' --var target:"JOB_A" -- echo "test comment test1" 
$ go run ./cmd/github-comment exec --org yuyaban --repo github-comment --pr 1 -k hello -u 'Comment.HasMeta && Comment.Meta.TemplateKey == "hello"' --var target:"JOB_A" -- echo "test comment test2"
$ go run ./cmd/github-comment exec --org yuyaban --repo github-comment --pr 1 -k hello -u 'Comment.HasMeta && Comment.Meta.TemplateKey == "hello"' --var target:"JOB_B" -- echo "test comment test1"

[yuyaban]

exit code: 0
stdout: test comment test2

stderr:
combined output: test comment test2

[yuyaban]

exit code: 0
stdout: test comment test1

stderr:
combined output: test comment test1