Add `init` support in 3.7 schema

> Run an init inside the container that forwards signals and reaps
  processes

This is supported on `run` and now on Swarm services too, so it's also
possible to have in on a composefile :).

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

cli/compose/convert/service.go

@@ -150,6 +150,7 @@ func Service(
 				ReadOnly:        service.ReadOnly,
 				Privileges:      &privileges,
 				Isolation:       container.Isolation(service.Isolation),
+				Init:            service.Init,
 			},
 			LogDriver:     logDriver,
 			Resources:     resources,

cli/compose/loader/loader_test.go

@@ -1415,3 +1415,60 @@ networks:
 	}
 	assert.DeepEqual(t, config, expected, cmpopts.EquateEmpty())
 }
+
+func TestLoadInit(t *testing.T) {
+	booleanFalse := false
+	booleanTrue := true
+	config, err := loadYAML(`
+version: '3.7'
+services:
+  foo:
+    image: alpine`)
+	assert.NilError(t, err)
+	assert.Check(t, is.DeepEqual(config, &types.Config{
+		Filename: "filename.yml",
+		Version:  "3.7",
+		Services: types.Services{
+			{
+				Name:  "foo",
+				Image: "alpine",
+			},
+		},
+	}, cmpopts.EquateEmpty()))
+	config, err = loadYAML(`
+version: '3.7'
+services:
+  foo:
+    image: alpine
+    init: true`)
+	assert.NilError(t, err)
+	assert.Check(t, is.DeepEqual(config, &types.Config{
+		Filename: "filename.yml",
+		Version:  "3.7",
+		Services: types.Services{
+			{
+				Name:  "foo",
+				Image: "alpine",
+				Init:  &booleanTrue,
+			},
+		},
+	}, cmpopts.EquateEmpty()))
+	config, err = loadYAML(`
+version: '3.7'
+services:
+  foo:
+    image: alpine
+    init: false`)
+	assert.NilError(t, err)
+	assert.Check(t, is.DeepEqual(config, &types.Config{
+		Filename: "filename.yml",
+		Version:  "3.7",
+		Services: types.Services{
+			{
+				Name:  "foo",
+				Image: "alpine",
+				Init:  &booleanFalse,
+			},
+		},
+	}, cmpopts.EquateEmpty()))
+}

cli/compose/schema/bindata.go

@@ -467,7 +467,7 @@ DoTuq9lAU9Q4O1xV/59X/w8AAP//zRo7vm9CAAA=
 
 	"/data/config_schema_v3.7.json": {
 		local:   "data/config_schema_v3.7.json",
-		size:    17740,
+		size:    17777,
 		modtime: 1518458244,
 		compressed: `
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 `,
 	},
 

cli/compose/schema/data/config_schema_v3.7.json

@@ -154,6 +154,7 @@
         "healthcheck": {"$ref": "#/definitions/healthcheck"},
         "hostname": {"type": "string"},
         "image": {"type": "string"},
+        "init": {"type": "boolean"},
         "ipc": {"type": "string"},
         "isolation": {"type": "string"},
         "labels": {"$ref": "#/definitions/list_or_dict"},

cli/compose/types/types.go

@@ -119,7 +119,9 @@ type ServiceConfig struct {
 	Hostname        string                           `yaml:",omitempty"`
 	HealthCheck     *HealthCheckConfig               `yaml:",omitempty"`
 	Image           string                           `yaml:",omitempty"`
+	Init            *bool                            `yaml:",omitempty"`
 	Ipc             string                           `yaml:",omitempty"`
+	Isolation       string                           `mapstructure:"isolation" yaml:"isolation,omitempty"`
 	Labels          Labels                           `yaml:",omitempty"`
 	Links           []string                         `yaml:",omitempty"`
 	Logging         *LoggingConfig                   `yaml:",omitempty"`
@@ -142,8 +144,8 @@ type ServiceConfig struct {
 	User            string                           `yaml:",omitempty"`
 	Volumes         []ServiceVolumeConfig            `yaml:",omitempty"`
 	WorkingDir      string                           `mapstructure:"working_dir" yaml:"working_dir,omitempty"`
-	Isolation       string                           `mapstructure:"isolation" yaml:"isolation,omitempty"`
-	Extras          map[string]interface{}           `yaml:",inline"`
+
+	Extras map[string]interface{} `yaml:",inline"`
 }
 
 // BuildConfig is a type for build