Add missing field 'start_period' to Healthcheck

Author: dvallant

src/main/kotlin/de/gesellix/docker/compose/types/Healthcheck.kt

@@ -1,5 +1,6 @@
 package de.gesellix.docker.compose.types
 
+import com.squareup.moshi.Json
 import de.gesellix.docker.compose.adapters.CommandType
 
 data class Healthcheck(
@@ -9,5 +10,7 @@ data class Healthcheck(
         var retries: Float? = null,
         @CommandType
         var test: Command = Command(),
-        var timeout: String? = null
+        var timeout: String? = null,
+        @Json(name = "start_period")
+        var startPeriod: String? = null
 )

src/test/kotlin/de/gesellix/docker/compose/ComposeFileReaderTest.kt

@@ -484,7 +484,8 @@ fun newSampleConfigFull(): ComposeConfig {
       interval = "10s",
       retries = 5f,
       test = Command(parts = arrayListOf("echo \"hello world\"")),
-      timeout = "1s"
+      timeout = "1s",
+      startPeriod = "1s"
     ),
     hostname = "foo",
     image = "redis",

src/test/resources/de/gesellix/docker/compose/full/sample.yaml

@@ -114,6 +114,7 @@ services:
       interval: 10s
       timeout: 1s
       retries: 5
+      start_period: 1s
 
     # Any valid image reference - repo, tag, id, sha
     image: redis