fix: trim space from templates before render

Signed-off-by: Ben Meier <[email protected]>

internal/provisioners/templateprov/template.go

@@ -5,6 +5,8 @@ import (
 	"context"
 	"fmt"
 	"html/template"
+	"log/slog"
+	"strings"
 
 	"github.com/Masterminds/sprig/v3"
 	compose "github.com/compose-spec/compose-go/v2/types"
@@ -65,6 +67,7 @@ func (p *Provisioner) Match(resUid project.ResourceUid) bool {
 }
 
 func renderTemplateAndDecode(raw string, data interface{}, out interface{}) error {
+	raw = strings.TrimSpace(raw)
 	if raw == "" {
 		return nil
 	}
@@ -76,9 +79,13 @@ func renderTemplateAndDecode(raw string, data interface{}, out interface{}) erro
 	if err := prepared.Execute(buff, data); err != nil {
 		return fmt.Errorf("failed to execute template: %w", err)
 	}
+	if strings.TrimSpace(buff.String()) == "" {
+		return nil
+	}
 	dec := yaml.NewDecoder(buff)
 	dec.KnownFields(true)
 	if err := dec.Decode(out); err != nil {
+		slog.Debug(fmt.Sprintf("template output was '%s'", buff.String()))
 		return fmt.Errorf("failed to decode output: %w", err)
 	}
 	return nil