Add KRM exec and Docker functions support

[AhmedElsayed101]

Add KRM exec and Docker functions support

[AhmedElsayed101]

@aabouzaid the new PR.

[Copilot]

Pull Request Overview

This PR adds comprehensive KRM (Kubernetes Resource Model) exec and Docker functions support to Secretize, modernizing the tool to work with current Kustomize versions while maintaining backward compatibility with the legacy plugin system.

Key changes:

• Implements KRM function support with both exec and containerized modes
• Adds comprehensive examples and documentation for all usage patterns
• Fixes string literal parsing bug for key-value pairs containing equals signs
• Updates dependencies and Go version to support modern Kubernetes tooling

Reviewed Changes

Copilot reviewed 34 out of 35 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
cmd/secretize/main.go	Adds KRM function processor and dual-mode execution support
pkg/generator/generator.go	Fixes literal parsing bug and import organization
pkg/generator/krm_integration_test.go	Comprehensive test suite for KRM function integration
go.mod	Updates Go version and adds KRM dependencies
Dockerfile	New containerized KRM function support
examples/	Extensive examples for legacy, exec, and Docker KRM functions
README.md	Updated documentation with KRM function usage patterns

Comments suppressed due to low confidence (2)

pkg/generator/krm_integration_test.go:15

• The test doesn't verify that environment variables are properly cleaned up if the test fails before the defer statement executes. Consider using t.Setenv() which automatically handles cleanup.

	os.Setenv("TEST_LITERAL", "literal-value")

pkg/generator/krm_integration_test.go:157

• The test case for input "simple" expects both key and value to be "simple", but this doesn't match the actual parsing logic which should handle cases without '=' differently.

		{"simple", "simple", "simple"},

[Copilot]

The code doesn't handle the case where no '=' is found in the string literal. If strings.Index returns -1, the subsequent slice operations will cause a panic or incorrect behavior.

Suggested change

	idx := strings.Index(stringLiteral, "=")
	idx := strings.Index(stringLiteral, "=")
	if idx == -1 {
	return nil
	}

[Copilot]

[nitpick] Error from os.Stdin.Stat() is ignored. While this might be intentional for detecting stdin availability, consider handling potential errors or adding a comment explaining why the error is safely ignored.

Suggested change

	stat, _ := os.Stdin.Stat()
	stat, err := os.Stdin.Stat()
	if err != nil {
	log.Warnf("Failed to stat stdin: %v", err)
	return false
	}