Below is the type of compilation error I was getting:

```
$ cmake -G Ninja ../.. -DPython_EXECUTABLE=python3.7 -DBUILD_TESTS=ON -DENABLE_COVERAGE=ON -DBUILD_CPP_DOCS=ON -DBUILD_PYTHON_DOCS=ON
...
$ ninja
[54/174] Building CXX object producer/api/cpp/CMakeFiles/test-asapo-producer.dir/unittests/test_producer_impl.cpp.o
FAILED: producer/api/cpp/CMakeFiles/test-asapo-producer.dir/unittests/test_producer_impl.cpp.o
ccache /usr/bin/c++  -I/home/marc-olivier/Documents/desy/dev/gitlab.desy.de/asapo/asapo/producer/api/cpp/include -I/home/marc-olivier/Documents/desy/dev/gitlab.desy.de/asapo/asapo/producer/api/cpp/../c/include -I/home/marc-olivier/Documents/desy/dev/gitlab.desy.de/asapo/asapo/common/cpp/include -g -O0 --coverage -fprofile-arcs -ftest-coverage -Wall -Wextra -pedantic -Wconversion -Wno-missing-field-initializers -fPIC -DGTEST_HAS_PTHREAD=1 -std=gnu++11 -MD -MT producer/api/cpp/CMakeFiles/test-asapo-producer.dir/unittests/test_producer_impl.cpp.o -MF producer/api/cpp/CMakeFiles/test-asapo-producer.dir/unittests/test_producer_impl.cpp.o.d -o producer/api/cpp/CMakeFiles/test-asapo-producer.dir/unittests/test_producer_impl.cpp.o -c /home/marc-olivier/Documents/desy/dev/gitlab.desy.de/asapo/asapo/producer/api/cpp/unittests/test_producer_impl.cpp
In file included from /home/marc-olivier/Documents/desy/dev/gitlab.desy.de/asapo/asapo/producer/api/cpp/unittests/test_producer_impl.cpp:15:
/home/marc-olivier/Documents/desy/dev/gitlab.desy.de/asapo/asapo/producer/api/cpp/unittests/mocking.h:20:14: error: ‘uint64_t asapo::MockDiscoveryService::UpdateFrequency()’ marked ‘override’, but does not override
   20 |     uint64_t UpdateFrequency() override {
      |              ^~~~~~~~~~~~~~~
```

As mentioned on
https://stackoverflow.com/questions/729692/why-should-text-files-end-with-a-newline
and
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html#tag_03_206,
POSIX defines a line as

> A sequence of zero or more non- <newline> characters plus a terminating <newline>
> character.

When a file does not terminate with an empty line, `Git` commands such
as `git diff` show the message `No newline at end of file`.

This commit adds a CI job `pre-commit` to enforce the formatting.

CMake was not generating the files `version.h` and `version_lib.go` into
the project source directory when building from a subdirectory such as
`./build/debug/`. So these files could not be found during compilation.