Create test workflows

.github/workflows/env.yml

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+on:
+    workflow_call:
+      inputs:
+        version:
+          type: string
+          required: false
+        path:
+          type: string
+          default: "."
+          required: false
+        cache:
+          type: string
+          default: "true"
+          required: false
+
+  jobs:
+    test-env:
+      strategy:
+        matrix:
+          os: [ubuntu-latest, macos-latest, windows-latest]
+      runs-on: ${{ matrix.os }}
+      steps:
+      - uses: actions/checkout@v4
+
+      - name: Create manifest file
+        run: |
+          cat > ${{ inputs.path }}/rokit.toml << EOF
+          [tools]
+          selene = "Kampfkarren/[email protected]"
+          stylua = "JohnnyMorganz/[email protected]"
+          rojo = "rojo-rbx/[email protected]"
+          EOF
+        shell: bash
+
+      - name: Run setup-rokit
+        uses: ./
+        with:
+          version: ${{ inputs.version }}
+          path: ${{ inputs.path }}
+          cache: ${{ inputs.cache }}
+
+      - name: Verify executables in PATH on bash
+        run: |
+          command -v selene
+          command -v stylua
+          command -v rojo
+        shell: bash
+
+      - name: Verify executables in PATH on pwsh
+        run: |
+          Get-Command "selene"
+          Get-Command "stylua"
+          Get-Command "rojo"
+        shell: pwsh

.github/workflows/test.yml

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+name: test
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - "**.yml"
+  pull_request:
+    paths:
+      - "**.yml"
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  test-cache:
+    uses: ./.github/workflows/env.yml
+    with:
+      cache: "true"
+  test-no-cache:
+    uses: ./.github/workflows/env.yml
+    with:
+      cache: "false"