feat: Implement docker init in docker service

Author: Maya Ozer

docs/resources/service.md

@@ -372,6 +372,8 @@ Optional:
 - `healthcheck` (Block List, Max: 1) A test to perform to check that the container is healthy (see [below for nested schema](#nestedblock--task_spec--container_spec--healthcheck))
 - `hostname` (String) The hostname to use for the container, as a valid RFC 1123 hostname
 - `hosts` (Block Set) A list of hostname/IP mappings to add to the container's hosts file (see [below for nested schema](#nestedblock--task_spec--container_spec--hosts))
+- `init` (Boolean) Configured whether an init process should be injected for the container. If unset this will default to the
+`dockerd` defaults.
 - `isolation` (String) Isolation technology of the containers running the service. (Windows only). Defaults to `default`.
 - `labels` (Block Set) User-defined key/value metadata (see [below for nested schema](#nestedblock--task_spec--container_spec--labels))
 - `mounts` (Block Set) Specification for mounts to be added to containers created as part of the service (see [below for nested schema](#nestedblock--task_spec--container_spec--mounts))

internal/provider/resource_docker_service.go

@@ -517,6 +517,12 @@ func resourceDockerService() *schema.Resource {
 										Elem:        &schema.Schema{Type: schema.TypeString},
 										Description: "List of Linux capabilities to drop from the container",
 									},
+									"init": {
+										Type:        schema.TypeBool,
+										Description: "Configured whether an init process should be injected for this container. If unset this will default to the `dockerd` defaults.",
+										Optional:    true,
+										Computed:    true,
+									},
 								},
 							},
 						},

internal/provider/resource_docker_service_structures.go

@@ -183,6 +183,9 @@ func flattenContainerSpec(in *swarm.ContainerSpec) []interface{} {
 	if len(in.CapabilityDrop) > 0 {
 		m["cap_drop"] = in.CapabilityDrop
 	}
+	if in.Init {
+		m["init"] = in.Init
+	}
 	out = append(out, m)
 	return out
 }
@@ -965,6 +968,9 @@ func createContainerSpec(v interface{}) (*swarm.ContainerSpec, error) {
 					containerSpec.CapabilityDrop = append(containerSpec.CapabilityDrop, cap.(string))
 				}
 			}
+			if value, ok := rawContainerSpec["init"]; ok {
+				containerSpec.Init = value.(bool)
+			}
 
 		}
 	}