fix appending password to text file on restart and add description to mention pg-wal creation

README.md

@@ -135,7 +135,9 @@ You need to specify different empty directory, like this
 -e DEFAULT_COLLATION="id_ID.utf8" \
 -e DEFAULT_CTYPE="id_ID.utf8" \
 -e PASSWORD_AUTHENTICATION="md5" \
--e INITDB_EXTRA_ARGS="<some more initdb command args>"
+-e INITDB_EXTRA_ARGS="<some more initdb command args>" \
+-v pgwal-volume:/opt/postgres/pg_wal \
+-e POSTGRES_INITDB_WALDIR=/opt/postgres/pg_wal
 ```
 
 The containers will use above parameters to initialize a new db cluster in the

scripts/env-data.sh

@@ -387,9 +387,9 @@ function pg_password() {
   if [ -z "${POSTGRES_PASS}"  ] && [ ! -f ${SETUP_LOCKFILE} ]; then
 	  POSTGRES_PASS=$(openssl rand -base64 15)
 	  touch ${SETUP_LOCKFILE}
-	  echo "$POSTGRES_PASS" >> /tmp/PGPASSWORD.txt
+	  echo "$POSTGRES_PASS" > /tmp/PGPASSWORD.txt
 	else
-	  echo "$POSTGRES_PASS" >> /tmp/PGPASSWORD.txt
+	  echo "$POSTGRES_PASS" > /tmp/PGPASSWORD.txt
   fi
 
 }
@@ -399,9 +399,9 @@ function replication_password() {
   if [ -z "${REPLICATION_PASS}"  ] && [ ! -f ${SETUP_LOCKFILE} ]; then
 	  REPLICATION_PASS=$(openssl rand -base64 15)
 	  touch ${SETUP_LOCKFILE}
-	  echo "$REPLICATION_PASS" >> /tmp/REPLPASSWORD.txt
+	  echo "$REPLICATION_PASS" > /tmp/REPLPASSWORD.txt
 	else
-	  echo "$REPLICATION_PASS" >> /tmp/REPLPASSWORD.txt
+	  echo "$REPLICATION_PASS" > /tmp/REPLPASSWORD.txt
   fi
 
 }