chore: Make the script and guide more robust

docs/pg-migration-guide/README.md

@@ -214,10 +214,9 @@ Get the promoted instance PG15 connection string by running
 $ tofu output --raw source_instance > pg_connection.txt
 ```
 
-
 ```sh
 #TODO | Need to do a dry run again
-$ ./postgres-perms-update.sh <db-name-whose-perms-we-want-to-be-fixed>
+$ ./postgres-perms-update.sh <main.tf directory> <db-name-whose-perms-we-want-to-be-fixed>
 ```
 
 # Step 4: Promote the instance

modules/postgresql/gcp/bin/create-dms.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-set -ex
+set -e
 
 # the directory we want to run the script in
 dir=${1}

modules/postgresql/gcp/bin/postgres-perms-update.sh

@@ -1,7 +1,11 @@
 #!/usr/bin/env bash
-set -ex
+set -e
+
+dir=${1}
+DB_NAME=${2}
+
+pushd ${dir}
 
-DB_NAME=${1}
 NEW_OWNER=${DB_NAME}-user
 # READ PG_CON from a file
 PG_CON=$(cat pg_connection.txt)
@@ -29,3 +33,5 @@ for sequence in $sequences; do
 done
 
 echo "Ownership of all tables in $DB_NAME has been granted to $NEW_OWNER."
+
+popd

modules/postgresql/gcp/bin/terraform-db-swap.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-set -ex
+set -e
 
 dir=${1}
 module_prefix=${2}

modules/postgresql/gcp/bin/terraform-state-rm.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-set -ex
+set -e
 
 dir=${1}
 module_prefix=${2}