Restore git directory for heroku builds

gistfile1.xml

<build>
  ....
    <profiles>
        <profile>
            <id>git</id>
            <activation>
                <file>
                    <missing>${basedir}/.git</missing>
                </file>
            </activation>
            <build>
                <plugins>
                    <plugin>
                        <groupId>org.codehaus.mojo</groupId>
                        <artifactId>exec-maven-plugin</artifactId>
                        <version>1.2.1</version>
                        <executions>
                            <execution>
                                <phase>validate</phase>
                                <id>clone-repo</id>
                                <goals>
                                    <goal>exec</goal>
                                </goals>
                                <configuration>
                                    <executable>git</executable>
                                    <arguments>
                                        <argument>clone</argument>
                                        <argument>-n</argument>
                                        <argument>https://bitbucket.org/mrdon/weapon-m.git</argument>
                                        <argument>${project.build.directory}/checkout</argument>
                                    </arguments>
                                </configuration>
                            </execution>
                        </executions>
                    </plugin>
                    <plugin>
                        <artifactId>maven-antrun-plugin</artifactId>
                        <version>1.7</version>
                        <executions>
                            <execution>
                                <phase>validate</phase>
                                <goals>
                                    <goal>run</goal>
                                </goals>
                                <configuration>
                                    <tasks>
                                        <copy todir="${basedir}/.git">
                                            <fileset dir="${project.build.directory}/checkout/.git"/>
                                        </copy>
                                    </tasks>
                                </configuration>
                            </execution>
                        </executions>
                    </plugin>
                </plugins>
            </build>
        </profile>
    </profiles>
    ...
</build>