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/test/build.cue

@@ -0,0 +1,45 @@
+package go
+
+import (
+	"dagger.io/dagger"
+	"dagger.io/dagger/engine"
+	"universe.dagger.io/go"
+	"universe.dagger.io/docker"
+	"universe.dagger.io/alpine"
+)
+
+dagger.#Plan & {
+	inputs: directories: testhello: path: "./data/hello"
+
+	actions: tests: build: {
+		_baseImage: alpine.#Build
+
+		simple: {
+			build: go.#Build & {
+				source: inputs.directories.testhello.contents
+				output: "/bin/hello"
+			}
+
+			exec: docker.#Run & {
+				input: _baseImage.output
+				command: {
+					name: "/bin/sh"
+					args: ["-c", "hello >> /output.txt"]
+				}
+				env: NAME: "dagger"
+				mounts: binary: {
+					dest:     build.output
+					contents: build.binary
+					source:   "/bin/hello"
+				}
+			}
+
+			verify: engine.#ReadFile & {
+				input: exec.output.rootfs
+				path:  "/output.txt"
+			} & {
+				contents: "Hi dagger!"
+			}
+		}
+	}
+}