build: moved magefiles directory to project root

Moved the magefiles directory back to the project's root directory and
created a separate go.mod file to keep the dependencies separated.

The idea was suggested here:
https://github.com/magefile/mage/issues/502

README.asciidoc

@@ -47,7 +47,6 @@ You can install Enbas with Mage using the following commands:
 [source,console]
 ----
 git clone https://github.com/dananglin/enbas.git
-cd enbas/internal/build/
 mage install
 ----
 

internal/build/go.mod

@@ -1,5 +0,0 @@
-module enbas-build
-
-go 1.22.0
-
-require github.com/magefile/mage v1.15.0

mage

@@ -1,8 +0,0 @@
-#!/usr/bin/env bash
-
-set -o errexit
-set -o nounset
-set -o pipefail
-
-cd ./internal/build
-mage $@

magefiles/go.mod

@@ -0,0 +1,5 @@
+module codeflow.dananglin.me.uk/apollo/enbas/magefiles
+
+go 1.22.3
+
+require github.com/magefile/mage v1.15.0

magefiles/mage.go

@@ -29,10 +29,6 @@ var Default = Build
 // To enable verbose mode set ENBAS_TEST_VERBOSE=1.
 // To enable coverage mode set ENBAS_TEST_COVER=1.
 func Test() error {
-	if err := changeToProjectRoot(); err != nil {
-		return fmt.Errorf("unable to change to the project's root directory; %w", err)
-	}
-
 	goTest := sh.RunCmd("go", "test")
 
 	args := []string{"./..."}
@@ -50,10 +46,6 @@ func Test() error {
 
 // Lint runs golangci-lint against the code.
 func Lint() error {
-	if err := changeToProjectRoot(); err != nil {
-		return fmt.Errorf("unable to change to the project's root directory; %w", err)
-	}
-
 	return sh.RunV("golangci-lint", "run", "--color", "always")
 }
 
@@ -61,10 +53,6 @@ func Lint() error {
 // To rebuild packages that are already up-to-date set ENBAS_BUILD_REBUILD_ALL=1
 // To enable verbose mode set ENBAS_BUILD_VERBOSE=1
 func Build() error {
-	if err := changeToProjectRoot(); err != nil {
-		return fmt.Errorf("unable to change to the project's root directory; %w", err)
-	}
-
 	main := "./cmd/" + app
 	binary := "./__build/" + app
 	flags := ldflags()
@@ -107,10 +95,6 @@ func Install() error {
 
 // Clean clean the workspace.
 func Clean() error {
-	if err := changeToProjectRoot(); err != nil {
-		return fmt.Errorf("unable to change to the project's root directory; %w", err)
-	}
-
 	if err := sh.Rm(app); err != nil {
 		return err
 	}
@@ -122,14 +106,6 @@ func Clean() error {
 	return nil
 }
 
-func changeToProjectRoot() error {
-	if err := os.Chdir("../.."); err != nil {
-		return fmt.Errorf("unable to change directory; %w", err)
-	}
-
-	return nil
-}
-
 // ldflags returns the build flags.
 func ldflags() string {
 	ldflagsfmt := "-s -w -X main.binaryVersion=%s -X main.gitCommit=%s -X main.goVersion=%s -X main.buildTime=%s"