feature/DO-1037/add_scripts_for_postgres (!7)

Reviewed-on: https://git.avroid.tech/DevOps/avroid_scripts/pulls/7

backup_scripts/postgres/pre_backup_docker.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+DATE=$(date +%F)
+DIRBACKUP="/data/backups"
+DBUSER="postgres"
+
+getDbName() {
+    docker exec postgresql bash -c "psql -lA -x -U postgres -p 5432 -d postgres | \
+                                    grep Name | grep -v -P 'template0|template1' | cut -f 2  -d '|'"
+}
+
+DBLIST=$(getDbName)
+
+createBackup() {
+    for db in $DBLIST; do
+        echo "===================================="
+        echo "START create backup database: ${db}"
+
+        docker exec postgresql bash -c "pg_dump -Fc -U ${DBUSER} -p 5432 -d ${db}" > "${DIRBACKUP}/${db}-${DATE}".sql
+        
+        bzip2 -9 "${DIRBACKUP}/${db}-${DATE}".sql
+
+        echo "END database bzip2: ${db}"
+    done
+}
+
+[[ $(ls -A ${DIRBACKUP}) ]] 2>/dev/null && echo "dir ${DIRBACKUP} not empty" && exit 123
+
+createBackup