chore: add installer e2e tests

.github/workflows/installer.yml

@@ -0,0 +1,30 @@
+name: Install
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  install:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-14]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Test install script on bash
+        run: | 
+          bash -c 'bash ./install.sh'
+          bash -c 'atuin --help'
+
+      - name: Test install script on zsh
+        run: | 
+          zsh -c 'bash ./install.sh'
+          zsh -c 'atuin --help'