Add PostgreSQL with DB for Keycloak
diff --git a/postgres/docker/Dockerfile b/postgres/docker/Dockerfile
new file mode 100644
index 0000000..4b4874f
--- /dev/null
+++ b/postgres/docker/Dockerfile
@@ -0,0 +1,7 @@
+FROM postgres:15-alpine
+
+COPY entrypoint /sa-entrypoint
+RUN chmod 544 /sa-entrypoint
+
+ENTRYPOINT ["/bin/sh", "/sa-entrypoint"]
+CMD ["postgres"]