ci: replace cmake script with bash script (#22246)

Bash has better error handling than cmake, and seem overall slightly
more suited to scripting than cmake.

.github/scripts/install_dependencies.cmake

@@ -1,27 +0,0 @@
-cmake_minimum_required(VERSION 3.10)
-
-if(APPLE)
-  execute_process(COMMAND brew update --quiet)
-  execute_process(COMMAND brew install automake ninja)
-  if(TEST_DEPS)
-    execute_process(COMMAND brew install cpanminus)
-  endif()
-else()
-  # Assuming ubuntu for now. May expand if required.
-  set(PACKAGES
-    autoconf
-    automake
-    build-essential
-    curl
-    gettext
-    libtool-bin
-    locales-all
-    ninja-build
-    pkg-config
-    unzip)
-  execute_process(COMMAND sudo apt-get update)
-  execute_process(COMMAND sudo apt-get install -y ${PACKAGES})
-  if(TEST_DEPS)
-    execute_process(COMMAND sudo apt-get install -y cpanminus)
-  endif()
-endif()

.github/scripts/install_deps.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+os=$(uname -s)
+if [[ $os == Linux ]]; then
+  sudo apt-get update
+  sudo apt-get install -y autoconf automake build-essential cmake curl gettext libtool-bin locales-all ninja-build pkg-config unzip "$@"
+elif [[ $os == Darwin ]]; then
+  brew update --quiet
+  brew install automake ninja "$@"
+fi