Xcode Cloud Support (#234)

* Removed now unnecessary code from alpha builds
* Add nightly build configuration
* Update ruby dependencies
* Stop changing the app name for PRs and Nightly, the icon is sufficient
* Add ITSAppUsesNonExemptEncryption flag as per https://developer.apple.com/documentation/bundleresources/information_property_list/itsappusesnonexemptencryption and https://stackoverflow.com/questions/35841117/missing-compliance-status-in-testflight
* Updated app groups to reflect various environments: production, nightly and PR. Remove keychain access group as they should be inferred from the access groups

ci_scripts/ci_common.sh

@@ -0,0 +1,37 @@
+#!/bin/sh
+
+setup_environment () {
+    # Return on failures
+    # Fail when expanding unset variables
+    # Trace each command before executing it
+    set -eEu
+
+    # Move to the project root
+    cd ..
+
+    # Prevent installing dependencies in system directories
+    echo 'export GEM_HOME=$HOME/.gem' >>~/.zshrc
+    echo 'export PATH=$GEM_HOME/bin:$PATH' >>~/.zshrc
+    echo 'export PATH="/usr/local/opt/ruby@2.7/bin:$PATH"' >> ~/.zshrc
+
+    export GEM_HOME=$HOME/.gem
+    export PATH=$GEM_HOME/bin:$PATH
+    export PATH="/usr/local/opt/ruby@2.7/bin:$PATH"
+
+    # Things don't work well on the default ruby version
+    brew install "ruby@2.7"
+
+    gem install bundler
+
+    bundle config path vendor/bundle
+    bundle install --jobs 4 --retry 3
+}
+
+install_brew_dependencies () {
+    brew install "xcodegen"
+    brew install "imagemagick"
+}
+
+install_python_dependencies () {
+    pip3 install -r requirements.txt # Install towncrier for generating changelogs
+}