feat: add postgresql backup & restore snippets

docs/linux/postgresql-backup-restore.md

@@ -0,0 +1,66 @@
+# Postgresql Backup and Restore in Docker
+
+## Make pg backup
+
+```shell
+docker exec -e PGPASSWORD='<SuperSecure>' <ContainerName> \
+  pg_dump -U <PostgresRole> -d <PostgresDB> -Fc -f /tmp/database.dump
+```
+
+## Copy backup to root
+
+```shell
+docker cp <ContainerName>:/tmp/database.dump /root/database.dump
+```
+
+## Stop and remove old container
+
+```shell
+docker stop <ContainerName>
+docker rm <ContainerName>
+```
+
+## Remove old database files
+
+```shell
+rm -rf /mnt/<PostgresDBDatadir>/
+mkdir /mnt/<PostgresDBDatadir>/
+chown 999 /mnt/<PostgresDBDatadir>/
+chmod 700 /mnt/<PostgresDBDatadir>/
+```
+
+## Start new container
+```shell
+docker run \
+  --name <ContainerName> \
+  --detach \
+  --restart unless-stopped \
+  --network <ContainerNetwork> \
+  --volume /mnt/<PostgresDBDatadir>:/var/lib/postgresql/data \
+  --env POSTGRES_DB=<PostgresDB> \
+  --env POSTGRES_USER=<PostgresRole> \
+  --env POSTGRES_PASSWORD=<SuperSecure>
+  docker.io/library/postgres:17
+```
+
+## Copy backup to new container
+
+```shell
+docker cp /root/database.dump <ContainerName>:/tmp/database.dump
+```
+
+## Verify role and db
+
+```shell
+docker exec -e PGPASSWORD='<SuperSecure>' <ContainerName> \
+  psql -U <PostgresRole> -c "CREATE ROLE <PostgresRole> WITH LOGIN PASSWORD '<SuperSecure>';"
+docker exec -e PGPASSWORD='<SuperSecure>' <ContainerName> \
+  psql -U <PostgresRole> -c "CREATE DATABASE <PostgresDB> OWNER <PostgresRole>;"
+```
+
+## Restore backup
+
+```shell
+docker exec -e PGPASSWORD='<SuperSecure>' <ContainerName> \
+  pg_restore -U <PostgresRole> -d <PostgresDB> -Fc /tmp/database.dump
+```