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

.github/workflows/ubuntu.yml

@@ -116,16 +116,20 @@ jobs:
           - elixir-version: 'master'
             otp-version: '25'
             os:  'ubuntu-20.04'
-          - gleam-version: '0.16'
+          - gleam-version: 'nightly'
             otp-version: '24'
-            rebar3-version: '3.16'
-            os: 'ubuntu-latest'
-          - gleam-version: '0.19.0-rc3'
+          - gleam-version: '0.23'
             otp-version: '24'
             os: 'ubuntu-latest'
-          - gleam-version: '0.19.0-rc3'
+          - gleam-version: '0.23.0-rc1'
+            otp-version: '24'
+            os: 'ubuntu-latest'
+          - gleam-version: '0.23.0-rc1'
             otp-version: false
             os: 'ubuntu-latest'
+          - gleam-version: '0.22.0' # Version with Gleam's old archive naming convention
+            otp-version: '24'
+            os: 'ubuntu-latest'
     steps:
       - uses: actions/checkout@v2
       - name: Use erlef/setup-beam
@@ -166,11 +170,6 @@ jobs:
           cd test-projects/erlang_rebar3
           rebar3 ct
         if: ${{matrix.combo.rebar3-version}}
-      - name: Run Gleam/rebar3 project tests
-        run: |
-          cd test-projects/gleam_rebar3
-          rebar3 eunit
-        if: ${{matrix.combo.gleam-version}}
       - name: Type check Gleam project (without installing Erlang/OTP)
         run: |
           cd test-projects/gleam_gleam
@@ -190,7 +189,7 @@ jobs:
         combo:
           - otp-version: '24'
             elixir-version: 'v1.12'
-            gleam-version: '0.19'
+            gleam-version: '0.23.0-rc1'
             rebar3-version: 'nightly'
             os: 'ubuntu-latest'
     steps: