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.go

@@ -6,23 +6,20 @@ import (
 
 // these get populated from main() and copied into the Globals object.
 var (
-	Appname   string
-	Version   string
-	Buildarch string
+	Appname string
+	Version string
 )
 
 type Globals struct {
-	Appname   string
-	Version   string
-	Buildarch string
+	Appname string
+	Version string
 }
 
 // nolint:revive // lc parameter is required by fx even if unused
 func New(lc fx.Lifecycle) (*Globals, error) {
 	n := &Globals{
-		Appname:   Appname,
-		Buildarch: Buildarch,
-		Version:   Version,
+		Appname: Appname,
+		Version: Version,
 	}
 	return n, nil
 }