Add docker image build

SmartClinicManagementSystem/app/build.gradle

@@ -1,5 +1,9 @@
 import org.springframework.boot.gradle.plugin.SpringBootPlugin
 
+plugins {
+    id 'org.springframework.boot' version '3.5.7'
+}
+
 apply plugin: 'java'
 apply plugin: 'org.springframework.boot'
 
@@ -28,11 +32,11 @@ dependencies {
     runtimeOnly 'com.mysql:mysql-connector-j'
     runtimeOnly 'io.jsonwebtoken:jjwt-jackson:0.12.6'
 
-    testImplementation "org.junit.jupiter:junit-jupiter-api:${junitVersion}"
-    testImplementation "org.junit.jupiter:junit-jupiter-params:${junitVersion}"
+    testImplementation "org.junit.jupiter:junit-jupiter-api:5.9.3"
+    testImplementation "org.junit.jupiter:junit-jupiter-params:5.9.3"
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
 
-    testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:${junitVersion}"
+    testRuntimeOnly "org.junit.jupiter:junit-jupiter-engine:5.9.3"
 }
 
 test {