[piped] Implement regex-based dynamic changes in the event watcher

[moko-poi]

What would you like to be added: Currently, the event watcher modifies specific locations in a designated file, making it dependent solely on yaml files. To enhance flexibility, we propose adding a feature to identify and modify matching sections using regular expressions.

For instance:

terraform.tfvars

batch_image_uri = "{account_id}.dkr.ecr.ap-northeast-1.amazonaws.com/{project}-{application_name}:rc-202309111328"
dbt_image_uri = "{account_id}.dkr.ecr.ap-northeast-1.amazonaws.com/{project}-{application_name}::rc-202309121257"
refresher_image_uri = "{account_id}.dkr.ecr.ap-northeast-1.amazonaws.com/{project}-{application_name}::rc-202307140930"

app.pipecd.yaml

  eventWatcher:
    - matcher:
        name: stg-service-data-image-update
      handler:
        type: GIT_UPDATE
        config:
          commitMessage: "[stg] Upgrade service-data service to the latest version"
          replacements:
            - file: terraform.tfvars
              regex: "{account_id}.dkr.ecr.ap-northeast-1.amazonaws.com/{project}-{application_name}:(rc-[0-9]{12})"

Why is this needed:

[kentakozuka]

Sounds good to me 👍

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