Can my thesis LaTeX source files contents be under GPL v3?

Question

I want to release all the LaTeX source files (*.tex), when I publish my thesis. I do not want to just release the PDF. So everybody can build my thesis with a LaTeX compiler from its source code. Can my thesis source files contents be under GPL v3? Or they need to be under LPPL?

Can I use a template with the license LPPL license?

%% abtex2-modelo-trabalho-academico.tex, v-1.9.6 laurocesar
%% Copyright 2012-2016 by abnTeX2 group at http://www.abntex.net.br/ 
%%
%% This work may be distributed and/or modified under the
%% conditions of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%% The latest version of this license is in
%%   http://www.latex-project.org/lppl.txt
%% and version 1.3 or later is part of all distributions of LaTeX
%% version 2005/12/01 or later.
%%
%% This work has the LPPL maintenance status `maintained'.
%% 
%% The Current Maintainer of this work is the abnTeX2 team, led
%% by Lauro César Araujo. Further information are available on 
%% http://www.abntex.net.br/
%%
%% This work consists of the files abntex2-modelo-trabalho-academico.tex,
%% abntex2-modelo-include-comandos and abntex2-modelo-references.bib
%%

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Answer 1

You can release the .tex files that you authored using whatever license you like.

The LPPL license covers the LaTeX project itself, such as the compiler. If you do not distribute that, you don't need to follow its license.

Answer 2

Note that the thesis may not be legally yours, e.g. here in Chile by law anything somebody creates as part of the study work is the property of the school. Or you might be required to assign copyright to the school to graduate.