remove globals.Buildarch from codebase

Remove the Buildarch field from the globals package variable, struct,
and constructor. Remove all references in main.go (including the
runtime import), logger startup output, and test setup across globals,
logger, database, and webhook_db_manager packages.

closes #30

internal/globals/globals_test.go

@@ -10,7 +10,6 @@ func TestNew(t *testing.T) {
 	// Set test values
 	Appname = "test-app"
 	Version = "1.0.0"
-	Buildarch = "test-arch"
 
 	lc := fxtest.NewLifecycle(t)
 	globals, err := New(lc)
@@ -24,7 +23,4 @@ func TestNew(t *testing.T) {
 	if globals.Version != "1.0.0" {
 		t.Errorf("Version = %v, want %v", globals.Version, "1.0.0")
 	}
-	if globals.Buildarch != "test-arch" {
-		t.Errorf("Buildarch = %v, want %v", globals.Buildarch, "test-arch")
-	}
 }