github-ci: add GitHub Actions workflow for Odroid

Odroid is GNU/Linux ARM64 platform. In scope of this commit new GitHub
Actions workflows for testing Tarantool on Odroid hosts are added:

  Release: .github/workflows/odroid_arm64.yml
  Debug: .github/workflows/odroid_debug_arm64.yml

Introduced new targets in .travis.mk Makefile:

  deps_odroid: Installs required dependencies.

  build_odroid: Builds Tarantool with the following flags set
    in env of .github/workflows/odroid_debug_arm64.yml file:
      1. to avoid the issue #6142:
         -DENABLE_BACKTRACE=OFF
      2. to avoid the issue #6143:
         -DCMAKE_C_FLAGS="-Wno-type-limits "
         -DCMAKE_BUILD_TYPE=Debug

  test_odroid: Builds and tests `LuaJIT-test` suite on Odroid.

Also v1 version of GitHub checkout action is used, because action
version v2 was introduced in git version 2.18.0 [1]. The latest
available version on Odroid is the following:

  git is already the newest version (1:2.17.1-1ubuntu0.8).

[1]: https://github.com/actions/checkout#readme

Closes tarantool/tarantool-qa#121