chore: Enable local workflow source inputs with frozen workflow lockfile (#1648)

Reference:
https://linear.app/speakeasy/issue/TFGEN-165/bug-snapshot-test-failures-due-to-custom-code

Previously, the internal usage frozen workflow lockfile flag would
always download OAS from the registry. For various reasons, local
sources may not be fully synchronized with the registry. This change
checks the workflow source inputs to determine if any are remote and
only then downloads from the registry for ensured access and
consistency.

Author: bflad

internal/run/source.go

@@ -79,6 +79,7 @@ func (e *LintingError) Error() string {
 func (w *Workflow) RunSource(ctx context.Context, parentStep *workflowTracking.WorkflowStep, sourceID, targetID, targetLanguage string) (string, *SourceResult, error) {
 	rootStep := parentStep.NewSubstep(fmt.Sprintf("Source: %s", sourceID))
 	source := w.workflow.Sources[sourceID]
+	hasRemoteInputs := workflowSourceHasRemoteInputs(source)
 	sourceRes := &SourceResult{
 		Source:    sourceID,
 		Diagnosis: suggestions.Diagnosis{},
@@ -109,7 +110,7 @@ func (w *Workflow) RunSource(ctx context.Context, parentStep *workflowTracking.W
 		rootStep.NewSubstep("Using Source Location Override")
 		currentDocument = w.SourceLocation
 		frozenSource = true
-	} else if w.FrozenWorkflowLock {
+	} else if w.FrozenWorkflowLock && hasRemoteInputs {
 		frozenSource = true
 		currentDocument, err = NewFrozenSource(w, rootStep, sourceID).Do(ctx, "unused")
 		if err != nil {
@@ -312,6 +313,17 @@ func getTempApplyPath(path string) string {
 	return filepath.Join(workflow.GetTempDir(), fmt.Sprintf("applied_%s%s", randStringBytes(10), filepath.Ext(path)))
 }
 
+// Returns true if any of the source inputs are remote.
+func workflowSourceHasRemoteInputs(source workflow.Source) bool {
+	for _, input := range source.Inputs {
+		if input.IsRemote() {
+			return true
+		}
+	}
+
+	return false
+}
+
 // Reformats yaml to json if necessary and writes to the output location
 func writeToOutputLocation(ctx context.Context, documentPath string, outputLocation string) error {
 	// If paths are the same, no need to do anything