fix(cmd/build): populate date variable when not set through ldflags (#11316)

# Which Problems Are Solved

When building zitadel through `go build` or using an IDE debugging tool,
ldflags are not passed by dedault. In the past this was taken care of by
the `make compile` command, which got replaced by NX. The `nx
@zitadel/api:build` command does not set the ldflags either. Only the
`pack-platform` command does.

Because the ldflags aren't passed, the `date` and other variables remain
empty in the `cmd/build` package. During init of the package, if the
`version` is empty it defaults to the `date` variable. When the `date`
field was empty, the parsed `dateTime` would default to `time.Now()`,
but the `date` variable remained empty, resulting in a empty version.

A consistently empty version string prevents upgrades of projections on
dev systems, as the version from the last run is used.

# How the Problems Are Solved

If date failed to parse and `dateTime` is set to Now, use the formated
string of `dateTime` as `date`.

# Additional Context

- Blocks https://github.com/zitadel/zitadel/pull/11239

backend/v3/api/instance/v2/convert/instance_test.go

@@ -9,6 +9,7 @@ import (
 	"google.golang.org/protobuf/types/known/timestamppb"
 
 	"github.com/zitadel/zitadel/backend/v3/domain"
+	"github.com/zitadel/zitadel/cmd/build"
 	filter_v2 "github.com/zitadel/zitadel/pkg/grpc/filter/v2"
 	filter_v2beta "github.com/zitadel/zitadel/pkg/grpc/filter/v2beta"
 	instance_v2 "github.com/zitadel/zitadel/pkg/grpc/instance/v2"
@@ -62,7 +63,7 @@ func TestDomainInstanceModelToGRPCBetaResponse(t *testing.T) {
 		ChangeDate:   timestamppb.New(now),
 		CreationDate: timestamppb.New(yesterday),
 		Name:         "Instance One",
-		Version:      "",
+		Version:      build.Version(),
 		Domains: []*instance_v2beta.Domain{
 			{
 				InstanceId:   "instance-1",
@@ -150,7 +151,7 @@ func TestDomainInstanceModelToGRPCResponse(t *testing.T) {
 		CreationDate: timestamppb.New(yesterday),
 		State:        instance_v2.State_STATE_RUNNING,
 		Name:         "Instance One",
-		Version:      "",
+		Version:      build.Version(),
 		CustomDomains: []*instance_v2.CustomDomain{
 			{
 				InstanceId:   "instance-1",
@@ -221,6 +222,7 @@ func TestDomainInstanceListModelToGRPCBetaResponse(t *testing.T) {
 					Name:         "test-instance",
 					CreationDate: timestamppb.New(now),
 					ChangeDate:   timestamppb.New(now),
+					Version:      build.Version(),
 					Domains:      []*instance_v2beta.Domain{},
 				},
 			},
@@ -257,6 +259,7 @@ func TestDomainInstanceListModelToGRPCBetaResponse(t *testing.T) {
 					Name:         "test-instance-1",
 					CreationDate: timestamppb.New(now),
 					ChangeDate:   timestamppb.New(now),
+					Version:      build.Version(),
 					Domains: []*instance_v2beta.Domain{
 						{
 							InstanceId:   "instance1",
@@ -272,6 +275,7 @@ func TestDomainInstanceListModelToGRPCBetaResponse(t *testing.T) {
 					Name:         "test-instance-2",
 					CreationDate: timestamppb.New(now),
 					ChangeDate:   timestamppb.New(now),
+					Version:      build.Version(),
 					Domains:      []*instance_v2beta.Domain{},
 				},
 			},
@@ -322,6 +326,7 @@ func TestDomainInstanceListModelToGRPCResponse(t *testing.T) {
 					CreationDate:  timestamppb.New(now),
 					ChangeDate:    timestamppb.New(now),
 					State:         instance_v2.State_STATE_RUNNING,
+					Version:       build.Version(),
 					CustomDomains: []*instance_v2.CustomDomain{},
 				},
 			},
@@ -359,6 +364,7 @@ func TestDomainInstanceListModelToGRPCResponse(t *testing.T) {
 					CreationDate: timestamppb.New(now),
 					ChangeDate:   timestamppb.New(now),
 					State:        instance_v2.State_STATE_RUNNING,
+					Version:      build.Version(),
 					CustomDomains: []*instance_v2.CustomDomain{
 						{
 							InstanceId:   "instance1",
@@ -375,6 +381,7 @@ func TestDomainInstanceListModelToGRPCResponse(t *testing.T) {
 					CreationDate:  timestamppb.New(now),
 					ChangeDate:    timestamppb.New(now),
 					State:         instance_v2.State_STATE_RUNNING,
+					Version:       build.Version(),
 					CustomDomains: []*instance_v2.CustomDomain{},
 				},
 			},

cmd/build/info.go

@@ -23,6 +23,7 @@ func init() {
 	if err != nil {
 		logging.WithError(err).Warn("could not parse build date, using current time instead")
 		dateTime = time.Now()
+		date = dateTime.Format(time.RFC3339)
 	}
 	if version == "" {
 		logging.Warn("no build version set, using timestamp as version")