add back functions that are still in use

Author: devm33

src/copilot-cli/install.sh

@@ -16,6 +16,22 @@ if [ "$(id -u)" -ne 0 ]; then
     exit 1
 fi
 
+apt_get_update()
+{
+    if [ "$(find /var/lib/apt/lists/* | wc -l)" = "0" ]; then
+        echo "Running apt-get update..."
+        apt-get update -y
+    fi
+}
+
+# Checks if packages are installed and installs them if not
+check_packages() {
+    if ! dpkg -s "$@" > /dev/null 2>&1; then
+        apt_get_update
+        apt-get -y install --no-install-recommends "$@"
+    fi
+}
+
 # Figure out correct version of a three part version number is not passed
 find_version_from_git_tags() {
     local variable_name=$1