Includes Scalingo to choose erlangs build urls

Author: nwittstruck

lib/canonical_version.sh

@@ -8,6 +8,9 @@ erlang_builds_url() {
     "heroku-22")
       erlang_builds_url="https://repo.hex.pm/builds/otp/ubuntu-22.04"
       ;;
+    "scalingo-20")
+      erlang_builds_url="https://repo.hex.pm/builds/otp/ubuntu-20.04"
+      ;;
     *)
       erlang_builds_url="https://s3.amazonaws.com/heroku-buildpack-elixir/erlang/cedar-14"
       ;;
@@ -26,6 +29,10 @@ fetch_erlang_versions() {
       url="https://repo.hex.pm/builds/otp/ubuntu-20.04/builds.txt"
       curl -s "$url" | awk '/^OTP-([0-9.]+ )/ {print substr($1,5)}'
       ;;
+    "scalingo-20")
+      url="https://repo.hex.pm/builds/otp/ubuntu-20.04/builds.txt"
+      curl -s "$url" | awk '/^OTP-([0-9.]+ )/ {print substr($1,5)}'
+      ;;
     "heroku-22")
       url="https://repo.hex.pm/builds/otp/ubuntu-22.04/builds.txt"
       curl -s "$url" | awk '/^OTP-([0-9.]+ )/ {print substr($1,5)}'