feat: add diode-replay-dryrun helper

[leoparente]

This pull request introduces a new CLI tool, diode-replay-dryrun, to replay dry-run files generated by the DryRunClient and send them to a Diode service. It also updates the project dependencies in go.mod. Below are the most important changes:

Addition of the diode-replay-dryrun CLI Tool

• Documentation Update: Added a new section in README.md explaining the purpose of the diode-replay-dryrun tool, installation instructions, and usage examples. The tool supports ingesting multiple JSON files and provides flexibility in specifying OAuth2 credentials via flags or environment variables.
• Implementation: Created a new main.go file for the CLI tool, which includes:
  • Parsing command-line flags for input files, target, app details, and OAuth2 credentials.
  • Loading and ingesting dry-run entities from JSON files using the diode SDK.
  • Handling errors and logging the results of ingestion.

Dependency Updates

• go.mod Changes: Updated the golang.org/x/net dependency to be a direct requirement instead of indirect. This ensures compatibility with the new CLI tool.

[github-actions]

Go test coverage

STATUS	ELAPSED	PACKAGE	COVER	PASS	FAIL	SKIP
🟢 PASS	0.01s	github.com/netboxlabs/diode-sdk-go/cmd/diode-replay-dryrun	0.0%	0	0	0
🟢 PASS	1.32s	github.com/netboxlabs/diode-sdk-go/diode	20.4%	218	0	0

Total coverage: 76.7%

[Copilot]

Pull Request Overview

Introduces a new CLI tool for replaying dry-run JSON files to a Diode service and updates project dependencies.

• Adds diode-replay-dryrun CLI in cmd/diode-replay-dryrun/main.go with flags for files, target, app info, and OAuth2 credentials.
• Updates go.mod to make golang.org/x/net a direct dependency.
• Documents installation and usage of the new CLI in README.md.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
go.mod	Promote golang.org/x/net to a direct requirement
cmd/diode-replay-dryrun/main.go	Implement the CLI tool for ingesting dry-run JSON files
README.md	Add documentation and usage examples for the new CLI helper

Comments suppressed due to low confidence (3)

cmd/diode-replay-dryrun/main.go:27

• [nitpick] The variable name version is ambiguous; consider renaming it to appVersion for consistency with the flag name and to improve clarity.

	version := flag.String("app-version", "", "Application version used when ingesting the dry-run messages")

cmd/diode-replay-dryrun/main.go:22

• Consider adding unit or integration tests for the CLI tool to verify flag parsing and ingestion behavior.

func main() {

README.md:179

• [nitpick] The example target path (/diode) differs from the flag description example (/diodet); update one for consistency.

  --target grpc://localhost:8080/diode \