feat: schema addition to specify contianer build network for buildpack

Author: bogdannazarenko

docs-v2/content/en/schemas/v4beta13.json

@@ -1031,6 +1031,11 @@
             "[\"key1=value1\", \"key2=value2\", \"key3={{.ENV_VARIABLE}}\"]"
           ]
         },
+        "network": {
+          "type": "string",
+          "description": "network to use for the build.",
+          "x-intellij-html-description": "network to use for the build."
+        },
         "projectDescriptor": {
           "type": "string",
           "description": "path to the project descriptor file.",
@@ -1066,7 +1071,8 @@
         "clearCache",
         "projectDescriptor",
         "dependencies",
-        "volumes"
+        "volumes",
+        "network"
       ],
       "additionalProperties": false,
       "type": "object",

pkg/skaffold/build/gcb/buildpacks.go

@@ -48,6 +48,10 @@ func (b *Builder) buildpackBuildSpec(artifact *latest.BuildpackArtifact, tag str
 		args = append(args, "--trust-builder")
 	}
 
+	if artifact.Network != "" {
+		args = append(args, "--network", artifact.Network)
+	}
+
 	env, err := misc.EvaluateEnv(artifact.Env)
 	if err != nil {
 		return cloudbuild.Build{}, fmt.Errorf("unable to evaluate env variables: %w", err)

pkg/skaffold/build/gcb/buildpacks_test.go

@@ -176,6 +176,21 @@ func TestBuildpackBuildSpec(t *testing.T) {
 				Images: []string{"img"},
 			},
 		},
+		{
+			description: "build network",
+			artifact: &latest.BuildpackArtifact{
+				Builder:           "builder",
+				ProjectDescriptor: "project.toml",
+				Network:           "cloudbuild",
+			},
+			expected: cloudbuild.Build{
+				Steps: []*cloudbuild.BuildStep{{
+					Name: "pack/image",
+					Args: []string{"pack", "build", "img", "--builder", "builder", "--network", "cloudbuild"},
+				}},
+				Images: []string{"img"},
+			},
+		},
 	}
 	for _, test := range tests {
 		testutil.Run(t, test.description, func(t *testutil.T) {

pkg/skaffold/schema/latest/config.go

@@ -1317,6 +1317,9 @@ type BuildpackArtifact struct {
 
 	// Volumes support mounting host volumes into the container.
 	Volumes []*BuildpackVolume `yaml:"volumes,omitempty"`
+
+	// Network is the network to use for the build.
+	Network string `yaml:"network,omitempty"`
 }
 
 // BuildpackDependencies *alpha* is used to specify dependencies for an artifact built by buildpacks.

pkg/skaffold/schema/validation/validation_test.go

@@ -556,6 +556,32 @@ func TestValidateNetworkMode(t *testing.T) {
 				},
 			},
 		},
+		{
+			description: "buildpack custom build network",
+			shouldErr:   false,
+			artifacts: []*latest.Artifact{
+				{
+					ImageName: "image/someimage",
+					ArtifactType: latest.ArtifactType{
+						BuildpackArtifact: &latest.BuildpackArtifact{
+							Network: "cloudbuild",
+						},
+					},
+				},
+			},
+		},
+		{
+			description: "buildpack build network omitted",
+			shouldErr:   false,
+			artifacts: []*latest.Artifact{
+				{
+					ImageName: "image/someimage",
+					ArtifactType: latest.ArtifactType{
+						BuildpackArtifact: &latest.BuildpackArtifact{},
+					},
+				},
+			},
+		},
 	}
 	for _, test := range tests {
 		testutil.Run(t, test.description, func(t *testutil.T) {