Add tests for binShell parameter with zsh and install zsh in CI

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Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/integration-tests.yml

@@ -46,7 +46,7 @@ jobs:
         if: matrix.os == 'linux'
         run: |
           sudo apt-get update
-          sudo apt-get install -y bubblewrap libseccomp-dev gcc socat ripgrep apparmor-profiles
+          sudo apt-get install -y bubblewrap libseccomp-dev gcc socat ripgrep apparmor-profiles zsh
 
       - name: Enable unprivileged user namespaces (Linux)
         if: matrix.os == 'linux'
@@ -63,7 +63,7 @@ jobs:
       - name: Install system dependencies (macOS)
         if: matrix.os == 'macos'
         run: |
-          brew install ripgrep
+          brew install ripgrep zsh
 
       - name: Install Node dependencies
         run: npm install