Remove the scriptz submodule and hard-commit the files.

The submodule is a leftover from when this project was intended to work
as a series of microservices. It was meant to provide common
functionality to the builds for every microservice. That's no longer the
case, and the submodule is a pain-point both in on-boarding new
developers and running the Docker build.

script/include/get_db_settings_functions.inc.sh

@@ -0,0 +1,15 @@
+# set_db_env_vars.inc.sh: Functions used by the set_db_env_vars script
+
+set_db_env_vars () {
+    local config_file="${1}"
+
+    # Read in and export all name=value pairs where the name starts with PG
+    # unless we already have an env var with that value
+    # (NOTE: all whitespaces are removed from each line)
+    while read -r DBVAR
+    do
+	if ! $(env | grep -qFle "${DBVAR%%=*}"); then
+            eval "export ${DBVAR}"
+	fi
+    done < <(grep -Ee '^PG' "${config_file}" | sed 's/ //g')
+}