ci: add action to access CI server over VNC

.github/macos_vnc.sh

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+# From https://github.com/vnc-tools/debug-on-mac.
+#
+# macos_vnc.sh VNC_USER_PASSWORD VNC_PASSWORD NGROK_AUTH_TOKEN
+
+# Disable spotlight indexing
+sudo mdutil -i off -a
+
+# Create new account
+sudo dscl . -create /Users/vncuser
+sudo dscl . -create /Users/vncuser UserShell /bin/bash
+sudo dscl . -create /Users/vncuser RealName "VNC User"
+sudo dscl . -create /Users/vncuser UniqueID 1001
+sudo dscl . -create /Users/vncuser PrimaryGroupID 80
+sudo dscl . -create /Users/vncuser NFSHomeDirectory /Users/vncuser
+sudo dscl . -passwd /Users/vncuser $1
+sudo dscl . -passwd /Users/vncuser $1
+sudo createhomedir -c -u vncuser >/dev/null
+
+# Enable VNC
+sudo /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart -configure -allowAccessFor -allUsers -privs -all
+sudo /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart -configure -clientopts -setvnclegacy -vnclegacy yes
+
+# Set VNC password
+# This sets the password directly in the preferences file becuase MacOS 10.14
+# and later does not allows control the Screen Sharing without using the UI
+# See: # http://hints.macworld.com/article.php?story=20071103011608872
+echo $2 | perl -we 'BEGIN { @k = unpack "C*", pack "H*", "1734516E8BA8C5E2FF1C39567390ADCA"}; $_ = <>; chomp; s/^(.{8}).*/$1/; @p = unpack "C*", $_; foreach (@k) { printf "%02X", $_ ^ (shift @p || 0) }; print "\n"' | sudo tee /Library/Preferences/com.apple.VNCSettings.txt
+
+# Start VNC/reset changes
+sudo /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart -restart -agent -console
+sudo /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart -activate
+
+# Install ngrok
+brew install --cask ngrok
+
+# Configure ngrok and start it
+ngrok authtoken $3
+ngrok tcp 5900 &

.github/workflows/macos_vnc.yml

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+# From https://github.com/vnc-tools/debug-on-mac.
+#
+# Set up the server for a VNC connection via ngrok.
+name: macos_vnc
+on:
+  workflow_dispatch:
+    inputs:
+      vnc_user_password:
+        description: Password for the created user (vncuser)
+        required: true
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  build:
+    runs-on: macos-13
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up environment
+        env:
+          NGROK_AUTH_TOKEN: ${{ secrets.NGROK_AUTH_TOKEN }}
+          VNC_USER_PASSWORD: ${{ github.event.inputs.vnc_user_password }}
+          VNC_PASSWORD: ${{ github.event.inputs.vnc_user_password }}
+        run: source .github/macos_vnc.sh "$VNC_USER_PASSWORD" "$VNC_PASSWORD" "$NGROK_AUTH_TOKEN"
+
+      - name: Set up Homebrew
+        id: set-up-homebrew
+        uses: Homebrew/actions/setup-homebrew@master
+
+      - name: Install Ableton Live
+        run: brew install --cask ableton-live-lite
+
+      - uses: actions/checkout@v3
+      - uses: actions/setup-python@v4
+        with:
+          python-version: 3.8
+          cache: pip
+
+      - run: python -m pip install poetry
+      - run: poetry install
+
+      - name: ngrok is now listening to VNC connections on...
+        run: curl --silent http://127.0.0.1:4040/api/tunnels | jq '.tunnels[0].public_url'
+
+      - name: Setup tmate session
+        uses: mxschmitt/action-tmate@v2