Apply Solomon comments on universe.dagger.io/go

- Improve #Container with a better docker.#Run integration
- Supports concurrency caching in #Container
- Simplify code maintainability and readability
- Simplify binary export in #Build
- Support multi binary building
- External #Version management

Signed-off-by: Vasek - Tom C <tom.chauveau@epitech.eu>

pkg/universe.dagger.io/go/build.cue

@@ -2,14 +2,10 @@ package go
 
 import (
 	"dagger.io/dagger"
-	"dagger.io/dagger/engine"
 )
 
 // Build a go binary
 #Build: {
-	// Go version to use
-	version: *#Image.version | string
-
 	// Source code
 	source: dagger.#FS
 
@@ -28,24 +24,27 @@ import (
 	// LDFLAGS to use for linking
 	ldflags: *"" | string
 
-	// Target binary output
-	output: string
-
 	env: [string]: string
 
-	_build: #Container & {
-		"version": version
-		"source":  source
-		"env":     env
-		args: ["build", "-v", "-tags", tags, "-ldflags", ldflags, "-o", output, package]
+	container: #Container & {
+		"source": source
+		"env":    env
+		command: {
+			args: [package]
+			flags: {
+				build:      true
+				"-v":       true
+				"-tags":    tags
+				"-ldflags": ldflags
+				"-o":       "/output/"
+			}
+		}
 	}
 
-	_copy: engine.#Copy & {
-		input:    engine.#Scratch
-		contents: _build.output.rootfs
-		source:   output
-		dest:     output
+	_binary: dagger.#Subdir & {
+		input: container.output.rootfs
+		path:  "/output"
 	}
 
-	binary: _copy.output
+	binary: _binary.output
 }