Expose code from internal package

[mozesl-nokia]

I've moved some code from the internal package to pkg so it can be used externally. The main use-case for this is Porch at the moment.

Currently moved:

• internal/fnruntime → pkg/fn/runtime

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[Copilot]

Pull request overview

This PR aims to make the function runtime code externally reusable by moving it out of internal and updating in-repo consumers to import it from pkg/fn/runtime.

Changes:

• Update call sites to import the runtime from github.com/kptdev/kpt/pkg/fn/runtime instead of internal/fnruntime.
• Rename the moved package from fnruntime to runtime within pkg/fn/runtime.
• Minor import cleanup in the wasmtime implementation.

Reviewed changes

Copilot reviewed 29 out of 29 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
thirdparty/kyaml/runfn/runfn.go	Switches function-runtime import to pkg/fn/runtime.
pkg/test/runner/runner.go	Updates test runner to import runtime from pkg/fn/runtime.
pkg/lib/kptops/eval_test.go	Updates eval tests to import runtime from pkg/fn/runtime.
pkg/lib/errors/resolver/container.go	Updates error resolver to reference pkg/fn/runtime error types.
pkg/fn/runtime/container.go	Renames package declaration to runtime.
pkg/fn/runtime/container_test.go	Renames package declaration to runtime.
pkg/fn/runtime/container_utils.go	Renames package declaration to runtime.
pkg/fn/runtime/container_utils_test.go	Renames package declaration to runtime.
pkg/fn/runtime/exec.go	Renames package declaration to runtime.
pkg/fn/runtime/fnerrors.go	Renames package declaration to runtime.
pkg/fn/runtime/fnerrors_test.go	Renames package declaration to runtime.
pkg/fn/runtime/imagepullpolicy.go	Renames package declaration to runtime.
pkg/fn/runtime/jsglue.go	Renames package declaration to runtime.
pkg/fn/runtime/nodejs.go	Renames package declaration to runtime.
pkg/fn/runtime/runner.go	Renames package declaration to runtime.
pkg/fn/runtime/runner_test.go	Renames package declaration to runtime.
pkg/fn/runtime/tag_resolution.go	Renames package declaration to runtime.
pkg/fn/runtime/tag_resolution_test.go	Renames package declaration to runtime.
pkg/fn/runtime/utils.go	Renames package declaration to runtime.
pkg/fn/runtime/utils_test.go	Renames package declaration to runtime.
pkg/fn/runtime/wasm.go	Renames package declaration to runtime.
pkg/fn/runtime/wasmtime.go	Renames package declaration to runtime and adjusts wasmtime-go import.
pkg/fn/runtime/wasmtime_unsupported.go	Renames package declaration to runtime.
internal/util/render/executor_test.go	Updates runtime import to pkg/fn/runtime.
internal/util/render/executor.go	Updates runtime import to pkg/fn/runtime.
internal/hook/executor.go	Updates runtime import to pkg/fn/runtime.
e2e/fn_test.go	Updates runtime import to pkg/fn/runtime.
commands/fn/doc/cmdfndoc_test.go	Updates runtime import to pkg/fn/runtime.
commands/fn/doc/cmdfndoc.go	Updates runtime import to pkg/fn/runtime.

Comments suppressed due to low confidence (2)

pkg/fn/runtime/runner.go:15

• pkg/fn/runtime is intended to be externally consumable, but this package still imports github.com/kptdev/kpt/internal/... (e.g., internal/builtins, internal/pkg, internal/types). Any external module importing github.com/kptdev/kpt/pkg/fn/runtime will fail to compile due to Go's internal visibility rules. To truly expose this runtime, move those dependencies to non-internal packages (or refactor to avoid them) so pkg/fn/runtime has no internal imports.
  pkg/fn/runtime/runner_test.go:17
• The file header comment describes Package pipeline/Pipeline, but the package is runtime. This mismatch will produce incorrect GoDoc for the package and is confusing for readers. Update the comment to describe what pkg/fn/runtime provides (or remove it if it’s not meant to be a package doc comment).

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[efiacor]

rebase required