feat: makes asdf-dotnet list all versions and improves performance

This commit completly removes the depency on dotnet releases json
maddness and instead uses a versions.txt file that gets updated on our
own repo.

This makes it almost instantly to list all version as we only need to
downloada simple txt file instead of waiting for hundreds of requests
and processing json with bash.

lib/utils.bash

@@ -2,7 +2,6 @@
 
 set -euo pipefail
 
-GH_REPO="https://github.com/dotnet/core"
 TOOL_NAME="dotnet"
 TOOL_TEST="dotnet --version"
 
@@ -13,49 +12,14 @@ fail() {
 
 curl_opts=(-fsSL)
 
-# NOTE: You might want to remove this if dotnet is not hosted on GitHub releases.
-if [ -n "${GITHUB_API_TOKEN:-}" ]; then
-  curl_opts=("${curl_opts[@]}" -H "Authorization: token $GITHUB_API_TOKEN")
-fi
-
-sort_versions() {
-  sed 'h; s/[+-]/./g; s/.p\([[:digit:]]\)/.z\1/; s/$/.z/; G; s/\n/ /' |
-    LC_ALL=C sort -t. -k 1,1 -k 2,2n -k 3,3n -k 4,4n -k 5,5n | awk '{print $2}'
-}
-
-list_github_tags() {
-  git ls-remote --tags --refs "$GH_REPO" |
-    grep -o 'refs/tags/.*' | cut -d/ -f3- |
-    sed 's/^v//' # NOTE: You might want to adapt this sed to remove non-version strings from tags
-}
-
-# taken from  asdf-dotnet-core plugin
-RELEASES_URI=https://raw.githubusercontent.com/dotnet/core/master/release-notes/releases-index.json
-FILE="releases.json"
-KEY="latest-sdk"
+RELEASES_URI=https://raw.githubusercontent.com/hensou/asdf-dotnet/main/versions.txt
 
 download() {
   curl "${curl_opts[@]}" $RELEASES_URI
 }
 
-match_key() {
-  grep -Eo '"'$1'": \".*\"'
-}
-
-sanitize() {
-  sed -e 's/"'$1'": \"//;s/\"//'
-}
-
-gnutac() {
-  if hash tac 2>/dev/null; then
-    tac "$@"
-  else
-    tail -r "$@"
-  fi
-}
-
 list_all_versions() {
-  echo $(download | match_key $FILE | sanitize $FILE | xargs -n 1 -P 0 curl | match_key $KEY | sanitize $KEY | sort -r) | sed 's/ /\n/g'
+  download | tr '\n' ' '
 }
 
 download_installer() {
@@ -67,18 +31,6 @@ download_installer() {
 
 }
 
-download_release() {
-  local version filename url
-  version="$1"
-  filename="$2"
-
-  # TODO: Adapt the release URL convention for dotnet
-  url="$GH_REPO/archive/v${version}.tar.gz"
-
-  echo "* Downloading $TOOL_NAME release $version..."
-  curl "${curl_opts[@]}" -o "$filename" -C - "$url" || fail "Could not download $url"
-}
-
 install_version() {
   local install_type="$1"
   local version="$2"