To upload the coverage to the correct commit in Teamscale, add a git.properties file to your jar/war. Depending on your environment there are multiple options:

Just add the following plugin to your build:

<build>
    <plugins>
        <plugin>
            <groupId>pl.project13.maven</groupId>
            <artifactId>git-commit-id-plugin</artifactId>
            <version>4.0.0</version>
        </plugin>
    </plugins>
</build>

Now build and deploy your application.