chore(spanner): update executor build to thin jar (googleapis#3316)

* chore(spanner): update executor config to build thin jar * chore(spanner): update executor config to build thin jar * chore(spanner): update executor config to build thin jar

Author: harshachinta

google-cloud-spanner-executor/assembly-descriptor.xml

@@ -160,30 +160,61 @@
 
  </dependencies>
  <build>
- <finalName>google-spanner-cloud-executor</finalName>
  <plugins>
  <plugin>
- <artifactId>maven-assembly-plugin</artifactId>
- <version>3.7.1</version>
+ <artifactId>maven-resources-plugin</artifactId>
+ <executions>
+ <execution>
+ <id>copy-resources</id>
+ <phase>validate</phase>
+ <goals>
+ <goal>copy-resources</goal>
+ </goals>
+ <configuration>
+ <outputDirectory>${project.build.directory}/spanner-executor</outputDirectory>
+ <resources>
+ <resource>
+ <directory>resources</directory>
+ <filtering>true</filtering>
+ </resource>
+ </resources>
+ </configuration>
+ </execution>
+ </executions>
+ </plugin>
+ <plugin>
+ <groupId>org.apache.maven.plugins</groupId>
+ <artifactId>maven-dependency-plugin</artifactId>
+ <executions>
+ <execution>
+ <id>copy-dependencies</id>
+ <phase>prepare-package</phase>
+ <goals>
+ <goal>copy-dependencies</goal>
+ </goals>
+ <configuration>
+ <outputDirectory>${project.build.directory}/spanner-executor/lib</outputDirectory>
+ <overWriteReleases>false</overWriteReleases>
+ <overWriteSnapshots>false</overWriteSnapshots>
+ <overWriteIfNewer>true</overWriteIfNewer>
+ </configuration>
+ </execution>
+ </executions>
+ </plugin>
+ <plugin>
+ <groupId>org.apache.maven.plugins</groupId>
+ <artifactId>maven-jar-plugin</artifactId>
  <configuration>
- <descriptors>
- <descriptor>assembly-descriptor.xml</descriptor>
- </descriptors>
+ <finalName>spanner-executor/google-spanner-cloud-executor</finalName>
  <archive>
+ <index>false</index>
  <manifest>
  <mainClass>com.google.cloud.executor.spanner.WorkerProxy</mainClass>
+ <addClasspath>true</addClasspath>
+ <classpathPrefix>lib/</classpathPrefix>
  </manifest>
  </archive>
  </configuration>
- <executions>
- <execution>
- <id>make-assembly</id>
- <phase>package</phase>
- <goals>
- <goal>single</goal>
- </goals>
- </execution>
- </executions>
  </plugin>
  <plugin>
  <groupId>org.apache.maven.plugins</groupId>