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-maven-plugin/src/main/java/org/springframework/boot/maven/CacheInfo.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2021 the original author or authors.
+ * Copyright 2012-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -32,8 +32,8 @@ public class CacheInfo {
 	public CacheInfo() {
 	}
 
-	CacheInfo(VolumeCacheInfo volumeCacheInfo) {
-		this.cache = Cache.volume(volumeCacheInfo.getName());
+	private CacheInfo(Cache cache) {
+		this.cache = cache;
 	}
 
 	public void setVolume(VolumeCacheInfo info) {
@@ -41,10 +41,23 @@ public class CacheInfo {
 		this.cache = Cache.volume(info.getName());
 	}
 
+	public void setBind(BindCacheInfo info) {
+		Assert.state(this.cache == null, "Each image building cache can be configured only once");
+		this.cache = Cache.bind(info.getSource());
+	}
+
 	Cache asCache() {
 		return this.cache;
 	}
 
+	static CacheInfo fromVolume(VolumeCacheInfo cacheInfo) {
+		return new CacheInfo(Cache.volume(cacheInfo.getName()));
+	}
+
+	static CacheInfo fromBind(BindCacheInfo cacheInfo) {
+		return new CacheInfo(Cache.bind(cacheInfo.getSource()));
+	}
+
 	/**
 	 * Encapsulates configuration of an image building cache stored in a volume.
 	 */
@@ -69,4 +82,28 @@ public class CacheInfo {
 
 	}
 
+	/**
+	 * Encapsulates configuration of an image building cache stored in a bind mount.
+	 */
+	public static class BindCacheInfo {
+
+		private String source;
+
+		public BindCacheInfo() {
+		}
+
+		BindCacheInfo(String name) {
+			this.source = name;
+		}
+
+		public String getSource() {
+			return this.source;
+		}
+
+		void setSource(String source) {
+			this.source = source;
+		}
+
+	}
+
 }