Remove macOS tests. (#792)

* Remove tests for macOS and document that macOS is not supported.

.github/workflows/run-tests.yml

@@ -20,7 +20,7 @@ jobs:
 
     strategy:
       matrix:
-        os: [macos-13, ubuntu-22.04, ubuntu-24.04]
+        os: [ubuntu-22.04, ubuntu-24.04]
 
     steps:
     - uses: actions/checkout@v4
@@ -31,38 +31,18 @@ jobs:
         python3 --version
         python3 -c "import multiprocessing as m; print('CPUs:', m.cpu_count())"
 
-    - name: Install dependencies (Ubuntu)
-      if: startsWith(matrix.os, 'ubuntu')
+    - name: Install dependencies
       run: |
         sudo apt-get update
         sudo apt-get -y install -qq gettext gir1.2-gdkpixbuf-2.0 gir1.2-glib-2.0 gir1.2-gtk-3.0 gir1.2-gtksource-4 gir1.2-pango-1.0 gir1.2-webkit2-4.1 python3 python3-enchant python3-gi python3-setuptools python3-yaml tox
 
-    - name: Install dependencies (macOS)
-      if: startsWith(matrix.os, 'macos')
-      run: |
-        # We need pygobject from PyPI. Using only pygobject3 from homebrew leads to "gi module not found".
-        # Homebrew complains about [email protected] files that are overwritten, so we remove them.
-        # Some can be removed by unlinking [email protected], others need to be removed manually.
-        brew unlink [email protected]
-        brew link --overwrite [email protected]
-        sudo rm -r /usr/local/bin/2to3 /usr/local/bin/idle3 /usr/local/bin/pydoc3 /usr/local/bin/python3 /usr/local/bin/python3-config /usr/local/share/man/man1/python3.1 /usr/local/lib/pkgconfig/python3-embed.pc /usr/local/lib/pkgconfig/python3.pc /usr/local/Frameworks/Python.framework/Headers /usr/local/Frameworks/Python.framework/Python /usr/local/Frameworks/Python.framework/Resources /usr/local/Frameworks/Python.framework/Versions/Current
-        brew install gettext gobject-introspection gtk+3 libffi cairo gtksourceview3 librsvg adwaita-icon-theme enchant
-        # Removing the Python files above makes pip complain about "managed environments", so we need to "break system packages".
-        python3 -m pip install --break-system-packages pyenchant pygobject pyyaml
-        python3 -m pip install --break-system-packages setuptools tox
-      env:
-        # https://docs.brew.sh/Manpage#install-options-formulacask-
-        HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK: on
-        HOMEBREW_NO_INSTALL_CLEANUP: on
-        HOMEBREW_NO_INSTALL_UPGRADE: on
-
     - name: Check style
       if: matrix.os == 'ubuntu-24.04'
       run: |
         tox -v -e style
 
     - name: Run tests
-      if: matrix.os == 'ubuntu-24.04'  # pip on macOS needs --break-system-packages
+      if: matrix.os == 'ubuntu-24.04'
       run: |
         python3 -c "import gi"
         tox -v -e py

web/src/downloads.html

@@ -73,6 +73,7 @@ <h4>Windows</h4>
   <h4>MacOS</h4>
   <div class="details">
     <ul>
+      <li><strong>Important:</strong> There is currently no official support for macOS. However, you can try the following on your own:</li>
       <li><a href="https://github.com/jendrikseipp/rednotebook/blob/master/dev/mac-homebrew.md">Install RedNotebook using Homebrew</a></li>
       <!--
       <li>