fix(tracing): treat resource detector errors as non-fatal

processOwnerDetector calls os/user.Current(), which fails in non-cgo
builds when the running UID has no /etc/passwd entry and $USER is unset
(common on hardened/distroless containers). It returns a plain error,
not ErrPartialResource, so the previous gate let the error escape and
SetupSDK aborted process startup.

Resource detection is documented as best-effort; downgrade any detector
error to a warning and fall back to an empty resource if the SDK returns
nil. The signature is preserved.

internal/otlpresource/resource.go

@@ -6,7 +6,6 @@ package otlpresource
 
 import (
 	"context"
-	"errors"
 	"log/slog"
 
 	"go.opentelemetry.io/otel/attribute"
@@ -21,8 +20,11 @@ type Options struct {
 	Environment    string // added as attribute "environment"
 }
 
-// New builds the shared OTel resource. Non-fatal partial/schema errors are
-// logged via the provided slog logger and a usable resource is still returned.
+// New builds the shared OTel resource. Resource detection is best-effort:
+// any detector error is logged via the provided slog logger and a usable
+// resource is still returned. The returned error is currently always nil; the
+// signature is preserved so future callers can distinguish hard failures if
+// the contract changes.
 func New(ctx context.Context, log *slog.Logger, opts Options) (*resource.Resource, error) {
 	detectors := []resource.Option{
 		resource.WithFromEnv(),      // OTEL_SERVICE_NAME / OTEL_RESOURCE_ATTRIBUTES
@@ -41,12 +43,16 @@ func New(ctx context.Context, log *slog.Logger, opts Options) (*resource.Resourc
 			resource.WithAttributes(attribute.String("environment", opts.Environment)))
 	}
 
+	// Detector failures (e.g. processOwnerDetector hitting user.Current() in
+	// a non-cgo build with no /etc/passwd entry and unset $USER) must not be
+	// fatal. Downgrade everything to a warning and fall back to an empty
+	// resource if the SDK returns nil.
 	res, err := resource.New(ctx, detectors...)
-	if errors.Is(err, resource.ErrPartialResource) || errors.Is(err, resource.ErrSchemaURLConflict) {
-		if log != nil {
+	if err != nil && log != nil {
 		log.Warn("otel resource setup", "err", err)
 	}
+	if res == nil {
+		res = resource.Empty()
+	}
 	return res, nil
 }
-	return res, err
-}

scripts/run-goreleaser

@@ -2,7 +2,7 @@
 
 set -euo pipefail
 
-go install github.com/goreleaser/goreleaser/v2@v2.14.1
+go install github.com/goreleaser/goreleaser/v2@v2.15.4
 
 if [ ! -z "${harbor_username:-}" ]; then
   DOCKER_FILE=~/.docker/config.json