Add tests for cluster configuration, command execution, and ArgoCD in…

[rumstead]

…tegration

• Introduced unit tests for RequestClusters unmarshalling from YAML and JSON formats.
• Updated schema.json to simplify validation for volumes, envs, labels, and annotations.
• Refactored command execution to capture stdout more efficiently.
• Added tests for command execution, including capturing stdout and handling errors.
• Enhanced ArgoCD deployment logic to use context for command execution and improved error handling.
• Added tests for ArgoCD agent functionalities, including generating arguments and replacing cluster URLs.
• Improved K3D cluster creation logic and added tests for argument parsing.
• Added tests for random string generation utility.

[Copilot]

Pull request overview

This PR strengthens the repo’s reliability and release automation by adding new unit tests across several packages, improving command execution and ArgoCD integration behavior, updating the JSON schema, and modernizing CI/release workflows and Go module dependencies.

Changes:

• Added unit tests for random utilities, k3d argument parsing, ArgoCD helper functions, and cluster config unmarshalling.
• Refactored command stdout capture and updated ArgoCD command execution to use contexts more consistently.
• Updated schema generation and modernized project automation (Go module/deps updates, new CI workflow, GoReleaser workflows, Dependabot).

Reviewed changes

Copilot reviewed 16 out of 17 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pkg/random/random_test.go	Adds tests validating random string length and allowed charset.
pkg/kubernetes/k3d/k3d.go	Improves path handling and cluster creation flow; simplifies arg pass-through.
pkg/kubernetes/k3d/k3d_test.go	Adds coverage for k3d cluster create argument generation.
pkg/gitops/argocd/argocd.go	Uses context-aware exec in more places; improves env restore handling; adjusts cluster add wiring.
pkg/gitops/argocd/argocd_test.go	Adds tests for arg generation, kubeconfig URL replacement, and bind address selection.
pkg/exec/exec.go	Refactors stdout capture to buffer-based approach.
pkg/exec/exec_test.go	Adds tests for command mapping and stdout/error behavior.
pkg/config/v1alpha1/schema.json	Simplifies object validation for volumes/envs/labels/annotations.
pkg/config/v1alpha1/cluster_config_test.go	Adds tests for YAML/JSON unmarshalling of cluster configs.
go.sum	Updates dependency checksums after module upgrades/tidy.
go.mod	Bumps Go version and updates direct/indirect dependencies.
cmd/clusters/clusters.go	Uses filepath-safe paths, safer cleanup, and ensures gitops ops run with timeout context.
.goreleaser.yaml	Updates config for GoReleaser v2 and snapshot templating.
.github/workflows/go_releaser_tags.yml	Modernizes tag release workflow (pinned actions, go-version-file, GoReleaser v2).
.github/workflows/go_releaser_branches.yml	Modernizes snapshot workflow for branches (pinned actions, go-version-file, GoReleaser v2).
.github/workflows/ci.yml	Adds CI for build/vet/test, tidy checks, and schema regeneration checks.
.github/dependabot.yml	Enables weekly dependency updates for Go modules and GitHub Actions.

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