Allow spring-boot-image-tests to run without an existing snapshot

Closes gh-28817

spring-boot-system-tests/spring-boot-image-tests/src/systemTest/java/org/springframework/boot/image/paketo/PaketoBuilderTests.java

@@ -32,6 +32,7 @@ import com.github.dockerjava.api.model.ContainerConfig;
 import org.assertj.core.api.Condition;
 import org.gradle.testkit.runner.BuildResult;
 import org.gradle.testkit.runner.TaskOutcome;
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.testcontainers.containers.GenericContainer;
@@ -61,6 +62,12 @@ class PaketoBuilderTests {
 
 	GradleBuild gradleBuild;
 
+	@BeforeEach
+	void configureGradleBuild() {
+		this.gradleBuild.scriptProperty("systemTestMavenRepository",
+				new File("build/system-test-maven-repository").getAbsoluteFile().toURI().toASCIIString());
+	}
+
 	@Test
 	void executableJarApp() throws Exception {
 		writeMainClass();

spring-boot-system-tests/spring-boot-image-tests/src/systemTest/resources/org/springframework/boot/image/paketo/PaketoBuilderTests-bootDistZipJarApp.gradle

@@ -6,6 +6,14 @@ plugins {
 }
 
 repositories {
+	exclusiveContent {
+		forRepository {
+			maven { url '{systemTestMavenRepository}' }
+		}
+		filter {
+			includeGroup "org.springframework.boot"
+		}
+	}
 	mavenCentral()
 	maven { url 'https://repo.spring.io/milestone' }
 	maven { url 'https://repo.spring.io/snapshot' }

spring-boot-system-tests/spring-boot-image-tests/src/systemTest/resources/org/springframework/boot/image/paketo/PaketoBuilderTests-executableWarApp.gradle

@@ -6,6 +6,14 @@ plugins {
 }
 
 repositories {
+	exclusiveContent {
+		forRepository {
+			maven { url '{systemTestMavenRepository}' }
+		}
+		filter {
+			includeGroup "org.springframework.boot"
+		}
+	}
 	mavenCentral()
 	maven { url 'https://repo.spring.io/milestone' }
 	maven { url 'https://repo.spring.io/snapshot' }

spring-boot-system-tests/spring-boot-image-tests/src/systemTest/resources/org/springframework/boot/image/paketo/PaketoBuilderTests-plainDistZipJarApp.gradle

@@ -6,6 +6,14 @@ plugins {
 }
 
 repositories {
+	exclusiveContent {
+		forRepository {
+			maven { url '{systemTestMavenRepository}' }
+		}
+		filter {
+			includeGroup "org.springframework.boot"
+		}
+	}
 	mavenCentral()
 	maven { url 'https://repo.spring.io/milestone' }
 	maven { url 'https://repo.spring.io/snapshot' }

spring-boot-system-tests/spring-boot-image-tests/src/systemTest/resources/org/springframework/boot/image/paketo/PaketoBuilderTests-plainWarApp.gradle

@@ -6,6 +6,14 @@ plugins {
 }
 
 repositories {
+	exclusiveContent {
+		forRepository {
+			maven { url '{systemTestMavenRepository}' }
+		}
+		filter {
+			includeGroup "org.springframework.boot"
+		}
+	}
 	mavenCentral()
 	maven { url 'https://repo.spring.io/milestone' }
 	maven { url 'https://repo.spring.io/snapshot' }

spring-boot-system-tests/spring-boot-image-tests/src/systemTest/resources/org/springframework/boot/image/paketo/PaketoBuilderTests.gradle

@@ -5,6 +5,14 @@ plugins {
 }
 
 repositories {
+	exclusiveContent {
+		forRepository {
+			maven { url '{systemTestMavenRepository}' }
+		}
+		filter {
+			includeGroup "org.springframework.boot"
+		}
+	}
 	mavenCentral()
 	maven { url 'https://repo.spring.io/milestone' }
 	maven { url 'https://repo.spring.io/snapshot' }

spring-boot-system-tests/spring-boot-image-tests/src/systemTest/resources/org/springframework/boot/image/paketo/settings.gradle

@@ -1,7 +1,22 @@
 pluginManagement {
 	repositories {
+		exclusiveContent {
+			forRepository {
+				maven { url '{systemTestMavenRepository}' }
+			}
+			filter {
+				includeGroup "org.springframework.boot"
+			}
+		}
 		maven { url 'https://repo.spring.io/milestone' }
 		maven { url 'https://repo.spring.io/snapshot' }
 		gradlePluginPortal()
 	}
+	resolutionStrategy {
+		eachPlugin {
+			if (requested.id.id == "org.springframework.boot") {
+				useModule "org.springframework.boot:spring-boot-gradle-plugin:${requested.version}"
+			}
+		}
+	}
 }