doc: Improve wording on “Go on Docker Hub” use case

Signed-off-by: Helder Correia <174525+helderco@users.noreply.github.com>

docs/tests/use-cases/ci-cd-for-go-project/complete-ci-cd/dagger.cue

@@ -30,8 +30,8 @@ dagger.#Plan & {
 			}
 		}
 
-		// Run go unit test
-		"unit-test": go.#Test & {
+		// Run go unit tests
+		unitTest: go.#Test & {
 			source:  _code
 			package: "./..."
 			input:   _base.output
@@ -43,21 +43,17 @@ dagger.#Plan & {
 		}
 
 		// Build docker image (depends on build)
-		image: {
-			_base: alpine.#Build & {}
-
-			docker.#Build & {
-				steps: [
-					docker.#Copy & {
-						input:    _base.output
-						contents: build.output
-						dest:     "/usr/bin"
-					},
-					docker.#Set & {
-						config: cmd: ["<path/to/binary>"]
-					},
-				]
-			}
+		image: docker.#Build & {
+			steps: [
+				alpine.#Build,
+				docker.#Copy & {
+					contents: build.output
+					dest:     "/usr/bin"
+				},
+				docker.#Set & {
+					config: cmd: ["<path/to/binary>"]
+				},
+			]
 		}
 
 		// Push image to remote registry (depends on image)
@@ -69,7 +65,7 @@ dagger.#Plan & {
 				"image": image.output
 				dest:    "\(_dockerUsername)/<my_repository>"
 				auth: {
-					username: "\(_dockerUsername)"
+					username: _dockerUsername
 					secret:   client.env.DOCKER_PASSWORD
 				}
 			}

docs/tests/use-cases/ci-cd-for-go-project/image.cue.fragment

@@ -4,19 +4,16 @@ import (
 )
 
 // Build docker image (depends on build)
-image: {
-	_base: alpine.#Build & {}
-
-	docker.#Build & {
-		steps: [
-			docker.#Copy & {
-				input:    _base.output
-				contents: build.output
-				dest:     "/usr/bin"
-			},
-			docker.#Set & {
-				config: cmd: ["</path/to/binary>"]
-			},
-		]
-	}
-}
+image: docker.#Build & {
+	steps: [
+		alpine.#Build,
+		docker.#Copy & {
+			input:    _base.output
+			contents: build.output
+			dest:     "/usr/bin"
+		},
+		docker.#Set & {
+			config: cmd: ["</path/to/binary>"]
+		},
+	]
+}

docs/tests/use-cases/ci-cd-for-go-project/push.cue.fragment

@@ -7,8 +7,8 @@ push: {
 		"image": image.output
 		dest:    "\(_dockerUsername)/<my_repository>"
 		auth: {
-			username: "\(_dockerUsername)"
+			username: _dockerUsername
 			secret:   client.env.DOCKER_PASSWORD
 		}
 	}
-}
+}

docs/tests/use-cases/ci-cd-for-go-project/test.cue.fragment

@@ -1,5 +1,5 @@
-// Run go unit test
-"unit-test": go.#Test & {
+// Run go unit tests
+unitTest: go.#Test & {
 	source:  _code
 	package: "./..."
 	input:   _base.output