add CI

.github/actions/env.yml

@@ -0,0 +1,14 @@
+name: Build Test Environment
+description: Build test environment for setup-aftman
+author: ok-nick
+
+runs:
+  using: 'composite'
+  steps:
+    - run: |
+        cat > aftman.toml << EOF
+        [tools]
+          selene = "Kampfkarren/selene@0.19.1"
+          stylua = "JohnnyMorganz/stylua@0.14.0"
+          rojo = "rojo-rbx/rojo@7.2.1"
+        EOF

.github/workflows/CI.yml

@@ -0,0 +1,37 @@
+name: CI
+on: [push, pull_request]
+
+jobs:
+  test_linux:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Setup environment
+        uses: ./.github/actions/env.yml
+
+      - name: Run setup-aftman
+        uses: ok-nick/setup-aftman@main
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+  test_mac:
+    runs-on: macos-latest
+    steps:
+      - name: Setup environment
+        uses: ./.github/actions/env.yml
+
+      - name: Run setup-aftman
+        uses: ok-nick/setup-aftman@main
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+  test_windows:
+    runs-on: windows-latest
+    steps:
+      - name: Setup environment
+        uses: ./.github/actions/env.yml
+
+      - name: Run setup-aftman
+        uses: ok-nick/setup-aftman@main
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+