Improve on "Add Windows to the mix" (#52)

* Support more OTP+Windows versions (try to bridge the gap with gleam-lang/setup-erlang that seems to support pre-21 versions)
* Merge ci.yml and test.yml
* Add Elixir to the Windows mix
* Hopefully improve error/warning messages
* Adapt the doc.s to the current reality
* Add option version-type (loose by default, for compatibility)

src/install-otp.sh

@@ -10,13 +10,9 @@ FILE_INPUT="${VSN}.tar.gz"
 FILE_OUTPUT=otp.tar.gz
 DIR_FOR_BIN=.setup-beam/otp
 
-rm -f "${FILE_OUTPUT}"
-rm -rf "${DIR_FOR_BIN}"
 wget -q -O "${FILE_OUTPUT}" "https://repo.hex.pm/builds/otp/${OS}/${FILE_INPUT}"
 mkdir -p "${DIR_FOR_BIN}"
 tar zxf "${FILE_OUTPUT}" -C "${DIR_FOR_BIN}" --strip-components=1
-rm -f "${FILE_OUTPUT}"
 "${DIR_FOR_BIN}/Install" -minimal "$(pwd)/${DIR_FOR_BIN}"
-echo "$(pwd)/${DIR_FOR_BIN}/bin" >> "$GITHUB_PATH"
 echo "Installed Erlang/OTP version follows"
 ${DIR_FOR_BIN}/bin/erl -version