use rvm

.gitea/workflows/test-pr.yml

@@ -12,10 +12,10 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v3
-      - uses: https://github.com/actions/setup-ruby@v1
+      - name: setup ruby
         if: matrix.os == 'arm-ubuntu-latest'
-        with:
-          ruby-version: '3.0'
+        run: |
+          curl -sSL https://get.rvm.io | bash -s stable
       - name: install tools
         run: |
           apt update -y