nix(refactor): Make with_tmp_db true checkedShellScript

This extends the interface of withTmpDb to allow loading different sets
of database fixtures via `postgrest-with-postgresql-xx --fixtures
<path>`.

test/create_test_db

@@ -62,11 +62,6 @@ EOF
 #Remove database path from the connection uri--prevents setting up the new database name with PGDATABASE
 URI=$(echo "$URI" | cut -d'/' -f1-3)
 
-PGDATABASE=$DB PGOPTIONS='-c client_min_messages=WARNING' psql "$URI" --set=db="$DB" -Xq <<EOF
-  CREATE EXTENSION IF NOT EXISTS pgcrypto;
-  ALTER DATABASE ${DB} SET request.jwt.claim.id = '-1';
-EOF
-
 # Create a new connection string to use with the test runner
 export PGRST_DB_URI="postgres://${TEST_USER_NAME}:$TEST_USER_PASS@$HOST_PORT/$DB"
 export PGRST_DB_ANON_ROLE="postgrest_test_anonymous"

test/fixtures/database.sql

@@ -1,3 +1,6 @@
+CREATE EXTENSION IF NOT EXISTS pgcrypto;
+ALTER DATABASE :DBNAME SET request.jwt.claim.id = '-1';
+
 set client_min_messages to warning;
 DROP SCHEMA IF EXISTS test, private, postgrest, jwt, public, تست, extensions, v1, v2 CASCADE;
 DROP TYPE IF EXISTS jwt_token CASCADE;

test/with_tmp_db

@@ -99,12 +99,7 @@ stop() {
 trap stop sigint sigterm exit
 
 log "Loading fixtures..."
-psql -v ON_ERROR_STOP=1 >> "$setuplog" << EOF
-  create extension pgcrypto;
-  alter database $PGDATABASE set request.jwt.claim.id = '-1';
-  alter role $PGUSER set default_text_search_config to english;
-  \i test/fixtures/load.sql
-EOF
+psql -v ON_ERROR_STOP=1 -f test/fixtures/load.sql >> "$setuplog"
 
 log "Done. Running command..."
 # Run the command that was given as an argument. The `exit` trap above will