Port go package to universe to resolves #1553

Definition are now split in their own file.
`#Image` is a simple base image to set up a go container
`#Container` is a standalone environment to execute go command, any go command
should use this definition.
It shares `docker.#Run` fields to easily maintains this definition.
`#Build` and `#Test` are high level definition that use `#Container` to
execute common go operation in a CI.

Those definitions are tested with a simple greeting package.

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

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

@@ -0,0 +1,53 @@
+// Go operation
+package go
+
+import (
+	"dagger.io/dagger"
+	"dagger.io/dagger/engine"
+	"universe.dagger.io/docker"
+)
+
+// A standalone go environment to run go command
+#Container: {
+	// Go version to use
+	version: *#Image.version | string
+
+	// Source code
+	source: dagger.#FS
+
+	// Arguments
+	args: [...string]
+
+	// Use go image
+	_image: #Image & {
+		"version": version
+	}
+
+	_sourcePath: "/src"
+	_cachePath:  "/root/.cache/gocache"
+
+	docker.#Run & {
+		input:   _image.output
+		workdir: "/src"
+		command: {
+			name:   "go"
+			"args": args
+		}
+		mounts: {
+			"source": {
+				dest:     _sourcePath
+				contents: source
+			}
+			"go assets cache": {
+				contents: engine.#CacheDir & {
+					id: "\(_cachePath)_assets"
+				}
+				dest: _cachePath
+			}
+		}
+		env: {
+			CGO_ENABLED: "0"
+			GOMODCACHE:  _cachePath
+		}
+	}
+}