Remove unnecessary config values from CI setup

.github/workflows/arduino_ci.yml

@@ -10,37 +10,3 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - uses: Arduino-CI/[email protected] # or latest, or a pinned version
-        env:
-          # Not all libraries are in the root directory of a repository.
-          # Specifying the path of the library here (relative to the root
-          # of the repository) will adjust that.
-          #
-          # The default is the current directory
-          #
-          USE_SUBDIR: .
-
-          # Not all libraries include examples or unit tests.  The default
-          #  behavior of arduino_ci is to assume that "if the files don't
-          #  exist, then they were not MEANT to exist".  In other words,
-          #  if you were to accidentally delete all your tests or example
-          #  sketches, then the CI runner would by default assume that was
-          #  intended and return a passing result.
-          #
-          # If you'd rather have the test runner fail the test in the
-          #  absence of either tests or examples, uncommenting either of
-          #  the following lines (as appropriate) will enforce that.
-          #
-          EXPECT_EXAMPLES: true
-          EXPECT_UNITTESTS: false
-
-          # Although dependencies will be installed automatically via the
-          # library manager, your library under test may require an
-          # unofficial version of a dependency.  In those cases, the custom
-          # libraries must be insalled prior to the test execution; those
-          # installation commands should be placed in a shell script (that
-          # will be executed by /bin/sh) and the shell script in your repo.
-          #
-          # Then, set this variable to the path to that file (relative to
-          # the repository root)
-          #
-          # CUSTOM_INIT_SCRIPT: install_dependencies.sh