Added a target to build a docker image

build.gradle

@@ -6,9 +6,10 @@ plugins {
     id 'idea'
     id 'maven-publish'
     id 'com.ryandens.javaagent-application' version "0.4.2"
+    id 'com.bmuschko.docker-java-application' version '9.4.0'
 }
 
-String rawVersion = project.hasProperty('version') ? project.version : '0.1.0-SNAPSHOT'
+String rawVersion = project.version != 'unspecified' ? project.version : '0.1.0-SNAPSHOT'
 def versionWithoutPrefix = rawVersion.replaceAll('^v', '')
 group = 'lt.pow.nukagit'
 version = versionWithoutPrefix
@@ -152,4 +153,18 @@ publishing {
             }
         }
     }
-}
+}
+
+docker {
+    javaApplication {
+        baseImage = 'gcr.io/distroless/java17-debian12:latest'
+        maintainer = 'Ignas Mikalajunas "[email protected]"'
+        ports = [2222, 50051]
+        images = ["nukagit:${versionWithoutPrefix}", 'nukagit:latest']
+        args = ['serve']
+    }
+}
+
+dockerCreateDockerfile {
+    environmentVariable 'JAVA_OPTS', '-XX:+UnlockExperimentalVMOptions -XX:+UseCGroupMemoryLimitForHeap'
+}

src/main/java/lt/pow/nukagit/config/ConfigModule.java

@@ -14,17 +14,21 @@ public class ConfigModule {
 
     @Provides
     Gestalt configurationProvider() {
-        String configPath = System.getProperty("nukagit.config_path", "config/application.yaml");
+        Path configPath = Path.of(System.getProperty("nukagit.config_path", "config/application.yaml"));
         Gestalt gestalt;
         try {
-            gestalt =
+            var gestaltBuilder =
                     new GestaltBuilder()
                             .addSource(
                                     ClassPathConfigSourceBuilder.builder()
-                                            .setResource("/default.properties").build()) // Load the default property files from resources.
-                            .addSource(FileConfigSourceBuilder.builder().setPath(Path.of(configPath)).build())
-                            .addSource(EnvironmentConfigSourceBuilder.builder().setPrefix("NUKAGIT_").setRemovePrefix(true).build())
-                            .build();
+                                            .setResource("/default.properties").build()); // Load the default property files from resources.
+
+            // check if the config file exists
+            if (configPath.toFile().exists()) {
+                gestaltBuilder.addSource(FileConfigSourceBuilder.builder().setPath(configPath).build());
+            }
+            gestaltBuilder.addSource(EnvironmentConfigSourceBuilder.builder().setPrefix("NUKAGIT_").setRemovePrefix(true).build());
+            gestalt = gestaltBuilder.build();
             gestalt.loadConfigs();
         } catch (GestaltException e) {
             throw new RuntimeException("Failed to load configuration!", e);