tarantool / luajit / 12686400663

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ci: add Valgrind testing workflow

This patch adds CI testing with Valgrind in three scenarios:
  - Full leak checks enabled.
  - No leak checks, with memory fill set to `--malloc-fill=0x00`
    and `--free-fill=0x00`.
  - No leak checks, with memory fill set to `--malloc-fill=0xff`
    and `--free-fill=0xff`.

The use of `0x00` and `0xff` for memory fill helps to detect dirty
reads. `0x00` mimics zero-initialized memory, which can mask some
uninitialized memory usage. `0xff` fills memory with non-zero values to
make such errors easier to spot.

Closes tarantool/tarantool#3705

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