public Builder addEntry(
        Path sourceFile, AbsoluteUnixPath pathInContainer, Instant modificationTime) {
      layerBuilder.addEntry(sourceFile, pathInContainer, modificationTime);
      return this;
    }
Adds an entry to the layer with the given file modification time. Only adds the single source
file to the exact path in the container file system. See {@link Builder#addEntry(Path,
AbsoluteUnixPath)} for more information.

@param sourceFile the source file to add to the layer
@param pathInContainer the path in the container file system corresponding to the {@code
    sourceFile}
@param modificationTime the file modification time
@return this
@see Builder#addEntry(Path, AbsoluteUnixPath)
jib-core/src/main/java/com/google/cloud/tools/jib/api/LayerConfiguration.java