docs: update sqlx script and add ci

- upgrades sqlx to 0.6
- fixes sqlite_dev_setup.sh script
- adds ci to test the script

swap/sqlite_dev_setup.sh

@@ -1,6 +1,14 @@
-# crated temporary DB
-# run the migration scripts to create the tables
-# prepare the sqlx-data.json rust mappings
+#!/bin/bash
+
+# run this script from the swap dir
+# make sure you have sqlx-cli installed: cargo install sqlx-cli
+
+# this script creates a temporary sqlite database
+# then runs the migration scripts to create the tables (migrations folder)
+# then it prepares the offline sqlx-data.json rust mappings
 DATABASE_URL=sqlite:tempdb cargo sqlx database create
 DATABASE_URL=sqlite:tempdb cargo sqlx migrate run
-DATABASE_URL=sqlite:./swap/tempdb cargo sqlx prepare -- --bin swap
+# needs the absolute path here
+# https://github.com/launchbadge/sqlx/issues/1399
+DB_PATH=$(readlink -f tempdb)
+DATABASE_URL="sqlite:$DB_PATH" cargo sqlx prepare -- --bin swap