go.#Build: small improvements

Signed-off-by: Solomon Hykes <solomon@dagger.io>

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

@@ -43,8 +43,9 @@ import (
 				"-o":       "/output/"
 			}
 		}
-		export: directories: "/output/": _
+		export: directories: "/output": _
 	}
 
-	binary: container.export.directories."/output/"
+	// Directory containing the output of the build
+	output: container.export.directories."/output"
 }

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

@@ -36,9 +36,6 @@ import (
 				dest: _cachePath
 			}
 		}
-		env: {
-			CGO_ENABLED: "0"
-			GOMODCACHE:  _cachePath
-		}
+		env: GOMODCACHE: _cachePath
 	}
 }

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

@@ -27,7 +27,7 @@ dagger.#Plan & {
 				env: NAME: "dagger"
 				mounts: binary: {
 					dest:     "/bin/hello"
-					contents: build.binary
+					contents: build.output
 					source:   "/test"
 				}
 			}

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

@@ -15,7 +15,7 @@ dagger.#Plan & {
 			command: args: ["version"]
 		}
 
-		overide: {
+		override: {
 			base: alpine.#Build & {
 				packages: go: _
 			}