Update for latest Gleam (#138)

* Update for latest Gleam

- Gleam releases now use LLVM triplets for platforms so the download
  URLs have been updated accordingly.
- Gleam's rebar3 support has been removed.

This change means that future versions of this action cannot download
older versions of Gleam. I can make it backwards compatible, but I will
need help from someone who can convert the shell script into PowerShell
for Windows.

* Support older Gleam versions

* Remove rebar from Gleam

src/install-gleam.ps1

@@ -4,7 +4,7 @@ $ErrorActionPreference="Stop"
 
 Set-Location ${Env:RUNNER_TEMP}
 
-$FILE_INPUT="gleam-${VSN}-windows-64bit.zip"
+$FILE_INPUT="gleam-${VSN}-x86_64-pc-windows-msvc.zip"
 $FILE_OUTPUT="gleam.zip"
 $DIR_FOR_BIN=".setup-beam/gleam"
 

src/install-gleam.sh

@@ -4,11 +4,26 @@ set -eo pipefail
 
 cd "${RUNNER_TEMP}"
 
-VSN=${1}
-FILE_INPUT=gleam-${VSN}-linux-amd64.tar.gz
+VSN="$1"
 FILE_OUTPUT=gleam.tar.gz
 DIR_FOR_BIN=.setup-beam/gleam
 
+version_gt() {
+  test "$(printf '%s\n' "$@" | sort -V | head -n 1)" != "$1"
+}
+
+uses_llvm_triplets() {
+  local version="$1"
+  test "$version" = "nightly" || version_gt "$version" "v0.22.1"
+}
+
+if uses_llvm_triplets "$VSN"
+then
+  FILE_INPUT="gleam-${VSN}-x86_64-unknown-linux-musl.tar.gz"
+else
+  FILE_INPUT="gleam-${VSN}-linux-amd64.tar.gz"
+fi
+
 wget -q -O "${FILE_OUTPUT}" "https://github.com/gleam-lang/gleam/releases/download/${VSN}/${FILE_INPUT}"
 mkdir -p "${DIR_FOR_BIN}/bin"
 tar zxf "${FILE_OUTPUT}" -C "${DIR_FOR_BIN}/bin"