Add environment variables (#94)

* Allow for Windows'22 container

(win22 is just a guess, at this moment)

* Add environment variables

* Clean up code

src/install-elixir.sh

@@ -2,7 +2,7 @@
 
 set -eo pipefail
 
-cd "$RUNNER_TEMP"
+cd "${RUNNER_TEMP}"
 
 VSN=${1}
 FILE_INPUT="${VSN}.zip"
@@ -14,3 +14,5 @@ mkdir -p "${DIR_FOR_BIN}"
 unzip -q -d "${DIR_FOR_BIN}" "${FILE_OUTPUT}"
 echo "Installed Elixir version follows"
 ${DIR_FOR_BIN}/bin/elixir -v
+
+echo "INSTALL_DIR_FOR_ELIXIR=${RUNNER_TEMP}/${DIR_FOR_BIN}" >> "${GITHUB_ENV}"