Repository: leanprover-community/mathlib-tools (language: python)

Issue:
Use --cask flag instead of cask command.
Folding in a [change from Homebrew 2.6.0+](https://brew.sh/2020/12/01/homebrew-2.6.0/), which caused the macOS script to bottom out when trying to install VS Code.

> All `brew cask` commands have been deprecated in favor of `brew` commands (with `--cask`) when necessary


Discussion / hints:

Fix patch:
diff --git a/scripts/install_debian.sh b/scripts/install_debian.sh
old mode 100644
new mode 100755
diff --git a/scripts/install_macos.sh b/scripts/install_macos.sh
old mode 100644
new mode 100755


Test patch:
diff --git a/.github/workflows/test_install_scripts.yml b/.github/workflows/test_install_scripts.yml
new file mode 100644
index 00000000..bcfd208d
--- /dev/null
+++ b/.github/workflows/test_install_scripts.yml
@@ -0,0 +1,34 @@
+name: Install Scripts CI
+
+on:
+  push:
+  pull_request:
+  release:
+    types: [published]
+
+jobs:
+  install_macos:
+    runs-on: macos-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version:
+          - name: 3.6
+            toxenv: py36
+          - name: 3.7
+            toxenv: py37
+          - name: 3.8
+            toxenv: py38
+          - name: 3.9
+            toxenv: py39
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Python ${{ matrix.python-version.name }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version.name }}
+    - name: Install mathlib-tools
+      run: ./scripts/install_macos.sh
+    - name: Check that leanproject runs
+      run: leanproject --help