dashboard: Use delimiter '@' only in maven-resources-plugin config of dashboard pom (#2046)

`${user.home}` should be resolve in dashboard runtime, not in maven package goal

sentinel-dashboard/pom.xml

@@ -13,6 +13,7 @@
     <packaging>jar</packaging>
 
     <properties>
+        <resource.delimiter>@</resource.delimiter>
         <spring.boot.version>2.0.5.RELEASE</spring.boot.version>
         <curator.version>4.0.1</curator.version>
     </properties>
@@ -138,6 +139,20 @@
 
     <build>
         <finalName>sentinel-dashboard</finalName>
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-resources-plugin</artifactId>
+                    <configuration>
+                        <delimiters>
+                            <delimiter>${resource.delimiter}</delimiter>
+                        </delimiters>
+                        <useDefaultDelimiters>false</useDefaultDelimiters>
+                    </configuration>
+                </plugin>
+            </plugins>
+        </pluginManagement>
         <plugins>
             <plugin>
                 <groupId>org.springframework.boot</groupId>

sentinel-dashboard/src/main/resources/application.properties

@@ -21,4 +21,4 @@ auth.password=sentinel
 
 # Inject the dashboard version. It's required to enable
 # filtering in pom.xml for this resource file.
-sentinel.dashboard.version=${project.version}
+sentinel.dashboard.version=@project.version@