Add support for caching to bind mounts when building images

When building an image using the Maven `spring-boot:build-image` goal or
the Gradle `bootBuildImage` task, the build and launch caches can be
configured to use a bind mount as an alternative to using a named
volume.

Closes gh-28387

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/tasks/bundling/BootBuildImageIntegrationTests-buildsImageWithBindCaches.gradle

@@ -0,0 +1,24 @@
+plugins {
+	id 'java'
+	id 'org.springframework.boot' version '{version}'
+}
+
+java {
+	sourceCompatibility = '1.8'
+	targetCompatibility = '1.8'
+}
+
+bootBuildImage {
+	builder = "projects.registry.vmware.com/springboot/spring-boot-cnb-builder:0.0.2"
+	pullPolicy = "IF_NOT_PRESENT"
+	buildCache {
+		bind {
+			source = System.getProperty('java.io.tmpdir') + "/junit-image-cache-${rootProject.name}-build"
+		}
+	}
+	launchCache {
+		bind {
+			source = System.getProperty('java.io.tmpdir') + "/junit-image-cache-${rootProject.name}-launch"
+		}
+	}
+}

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/src/test/resources/org/springframework/boot/gradle/tasks/bundling/BootBuildImageIntegrationTests-failsWhenCachesAreConfiguredTwice.gradle

@@ -12,10 +12,10 @@ bootBuildImage {
 	builder = "projects.registry.vmware.com/springboot/spring-boot-cnb-builder:0.0.2"
 	buildCache {
 		volume {
-			name = "build-cache-volume1"
+			name = "build-cache-volume"
 		}
-		volume {
-			name = "build-cache-volum2"
+		bind {
+			name = "/tmp/build-cache-bind"
 		}
 	}
 }