Getting Liquibase to run an SQL script on start up with SpringBoot Kotlin

Question

I'm having trouble getting liquibase to execute my sql script in my SpringBoot Kotlin appllication.

Here is my build.gradle.kts

import org.jetbrains.kotlin.gradle.tasks.KotlinCompile

plugins {
    id("org.springframework.boot") version "2.5.4"
    id("io.spring.dependency-management") version "1.0.11.RELEASE"
    kotlin("jvm") version "1.5.21"
    kotlin("plugin.spring") version "1.5.21"
}

group = "com.johncooper"
version = "0.0.1-SNAPSHOT"
java.sourceCompatibility = JavaVersion.VERSION_11

repositories {
    mavenCentral()
}

sourceSets.main {
    java.srcDirs("src/main")
}

sourceSets.test {
    java.srcDirs("src/test", "src/cucumber/kotlin", "src/cucumber")
}

dependencies {
    implementation("org.springframework.boot:spring-boot-starter-data-r2dbc")
    implementation("org.springframework.boot:spring-boot-starter-validation")
    implementation("org.springframework.boot:spring-boot-starter-webflux")
    implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
    implementation("io.projectreactor.kotlin:reactor-kotlin-extensions")
    implementation("org.jetbrains.kotlin:kotlin-reflect")
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-reactor")
    implementation("org.json:json:20211205")
    implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
    implementation("org.springdoc:springdoc-openapi-webflux-ui:1.6.4")
    implementation("org.springdoc:springdoc-openapi-kotlin:1.6.3")
    implementation("org.mariadb:r2dbc-mariadb")

    implementation("org.liquibase:liquibase-gradle-plugin:2.0.3")
    implementation("org.liquibase:liquibase-core:2.0.3")

    implementation("org.mariadb.jdbc:mariadb-java-client:3.0.3")
    testImplementation("org.jetbrains.kotlinx:kotlinx-coroutines-test")
    testImplementation("org.junit.jupiter:junit-jupiter-engine")
    testImplementation("org.testcontainers:testcontainers:1.16.0")
    testImplementation("org.testcontainers:junit-jupiter:1.16.0")
    testImplementation("org.testcontainers:mariadb:1.16.3")
    testImplementation("org.testcontainers:r2dbc:1.16.0")
    testImplementation("org.mockito.kotlin:mockito-kotlin:4.0.0")
    testImplementation("org.springframework.boot:spring-boot-starter-test")
    testImplementation("io.projectreactor:reactor-test")
    testImplementation("org.junit.vintage:junit-vintage-engine:5.7.2")
    testImplementation("io.cucumber:cucumber-java:6.11.0")
    testImplementation("io.cucumber:cucumber-spring:6.11.0")
    testImplementation("io.cucumber:cucumber-junit:6.11.0")
}

tasks.withType<KotlinCompile> {
    kotlinOptions {
        freeCompilerArgs = listOf("-Xjsr305=strict")
        jvmTarget = "11"
    }
}

tasks.withType<Test> {
    useJUnitPlatform()
}

tasks {
    test {
        filter {
            excludeTestsMatching("**.RunBDDTests")
        }
    }
}

task<Test>("acceptanceTest") {
    useJUnitPlatform()
    filter {
        includeTestsMatching("**.RunBDDTests")
    }
}

And here is my application.properties -

server.port=9000

spring.r2dbc.url=r2dbc:mariadb://0.0.0.0:3306/mydb
spring.r2dbc.username=testuser
spring.r2dbc.password=mypwd
spring.r2dbc.initialization-mode= always

spring.liquibase.url=jdbc:mariadb://0.0.0.0:3306/mydb
spring.liquibase.user=testuser
spring.liquibase.password=mypwd
spring.liquibase.change-log=classpath:db/changelog/db.changelog-master.xml
spring.liquibase.enabled=true

logging.level.org.springframework.data.r2dbc=INFO
debug=false
logging.level.com.johncooper=INFO

Here is my db.changelog-master.xml located in src/main/resources/db/changelog/ -

<databaseChangeLog
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
        xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
         http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.1.xsd">
    <include file="data.sql" relativeToChangelogFile="true"/>
</databaseChangeLog>

And here is the script I want execute data.sql -

# liquibase formatted sql
# changeset mydb:data

DROP TABLE IF EXISTS pets;

CREATE TABLE pets (
   id INT AUTO_INCREMENT  PRIMARY KEY,
   name VARCHAR(250) NOT NULL,
   description VARCHAR(250) NOT NULL,
   breed VARCHAR(250) NOT NULL,
   type VARCHAR(250) NOT NULL,
   price VARCHAR(250) NOT NULL
);

INSERT INTO pets (name, description, breed, type, price) VALUES
 ('Nemo', 'fish', 'piranah', 'a fricking fich', '$100')

# rollback DROP TABLE IF EXISTS mydb.pets

There are no errors on running the application ./gradlew bootRun through Intellij. The script simply doesn't get run. Can anybody spot what I am doing wrong?

Update - here is a link to the github repo with my code: https://github.com/johnnyalpha8/Pet-Shop