feat: set environment variables early in the boot

Fixes #7696

This allows to set env variables from `talos.environment=` command line
arg.

Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>
(cherry picked from commit d91b5b3)

internal/app/machined/pkg/runtime/v1alpha1/v1alpha1_sequencer.go

@@ -79,6 +79,7 @@ func (*Sequencer) Initialize(r runtime.Runtime) []runtime.Phase {
 			"etc",
 			CreateSystemCgroups,
 			CreateOSReleaseFile,
+			SetUserEnvVars,
 		).Append(
 			"machined",
 			StartMachined,
@@ -105,6 +106,7 @@ func (*Sequencer) Initialize(r runtime.Runtime) []runtime.Phase {
 			"etc",
 			CreateSystemCgroups,
 			CreateOSReleaseFile,
+			SetUserEnvVars,
 		).Append(
 			"earlyServices",
 			StartUdevd,