Bump PostgreSQL test images to 18

- postgres: 16.6 -> 18 (dao sql-test.properties / nosql-test.properties)
- timescaledb: latest-pg12 -> latest-pg18 (dao timescale-test.properties)

TimescaleDB pg15+ images crash on cgroup v2 CI hosts because
/docker-entrypoint-initdb.d/001_timescaledb_tune.sh evaluates
[ ${TS_TUNE_MEMORY} -gt ${FREE_BYTES} ] with an empty left operand
after the kernel reports the 64-bit max for /sys/fs/cgroup/memory.max.
Work around the upstream bug by setting NO_TS_TUNE=true.

The Testcontainers JDBC URL (jdbc:tc:timescaledb:...) does not support
docker env vars, so register a custom JdbcDatabaseContainerProvider
(TbTimescaleDBContainerProvider, activated via jdbc:tc:tbtimescaledb:...)
that starts a PostgreSQLContainer backed by timescale/timescaledb with
NO_TS_TUNE=true.

Production docker-compose files and tb-postgres image are untouched.

dao/src/test/java/org/thingsboard/server/dao/TbTimescaleDBContainerProvider.java

@@ -0,0 +1,47 @@
+/**
+ * Copyright © 2016-2026 The Thingsboard Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.thingsboard.server.dao;
+
+import org.testcontainers.containers.JdbcDatabaseContainer;
+import org.testcontainers.containers.TimescaleDBContainerProvider;
+
+/**
+ * Extends the upstream {@link TimescaleDBContainerProvider} to disable the
+ * timescaledb-tune entrypoint script via NO_TS_TUNE=true.
+ *
+ * Works around a shell bug in /docker-entrypoint-initdb.d/001_timescaledb_tune.sh
+ * that crashes the container entrypoint on cgroup v2 hosts (including CI agents)
+ * when the kernel reports the 64-bit max for memory.max.
+ *
+ * Activated by the jdbc:tc:tbtimescaledb:<tag>:///... URL prefix
+ * registered via META-INF/services.
+ */
+public class TbTimescaleDBContainerProvider extends TimescaleDBContainerProvider {
+
+    private static final String NAME = "tbtimescaledb";
+
+    @Override
+    public boolean supports(String databaseType) {
+        return NAME.equals(databaseType);
+    }
+
+    @Override
+    public JdbcDatabaseContainer newInstance(String tag) {
+        JdbcDatabaseContainer container = super.newInstance(tag);
+        container.withEnv("NO_TS_TUNE", "true");
+        return container;
+    }
+}

dao/src/test/resources/META-INF/services/org.testcontainers.containers.JdbcDatabaseContainerProvider

@@ -0,0 +1 @@
+org.thingsboard.server.dao.TbTimescaleDBContainerProvider

dao/src/test/resources/nosql-test.properties

@@ -13,6 +13,6 @@ spring.jpa.show-sql=false
 spring.jpa.hibernate.ddl-auto=none
 spring.datasource.username=postgres
 spring.datasource.password=postgres
-spring.datasource.url=jdbc:tc:postgresql:16.6:///thingsboard?TC_DAEMON=true&TC_TMPFS=/testtmpfs:rw&?TC_INITFUNCTION=org.thingsboard.server.dao.PostgreSqlInitializer::initDb
+spring.datasource.url=jdbc:tc:postgresql:18:///thingsboard?TC_DAEMON=true&TC_TMPFS=/testtmpfs:rw&?TC_INITFUNCTION=org.thingsboard.server.dao.PostgreSqlInitializer::initDb
 spring.datasource.driverClassName=org.testcontainers.jdbc.ContainerDatabaseDriver
 spring.datasource.hikari.maximumPoolSize=16

dao/src/test/resources/sql-test.properties

@@ -14,7 +14,7 @@ spring.jpa.show-sql=false
 spring.jpa.hibernate.ddl-auto=none
 spring.datasource.username=postgres
 spring.datasource.password=postgres
-spring.datasource.url=jdbc:tc:postgresql:16.6:///thingsboard?TC_DAEMON=true&TC_TMPFS=/testtmpfs:rw&?TC_INITFUNCTION=org.thingsboard.server.dao.PostgreSqlInitializer::initDb
+spring.datasource.url=jdbc:tc:postgresql:18:///thingsboard?TC_DAEMON=true&TC_TMPFS=/testtmpfs:rw&?TC_INITFUNCTION=org.thingsboard.server.dao.PostgreSqlInitializer::initDb
 spring.datasource.driverClassName=org.testcontainers.jdbc.ContainerDatabaseDriver
 spring.datasource.hikari.maximumPoolSize=16
 

dao/src/test/resources/timescale-test.properties

@@ -13,6 +13,6 @@ spring.jpa.show-sql=false
 spring.jpa.hibernate.ddl-auto=none
 spring.datasource.username=postgres
 spring.datasource.password=postgres
-spring.datasource.url=jdbc:tc:timescaledb:latest-pg12:///thingsboard?TC_DAEMON=true&TC_TMPFS=/testtmpfs:rw&?TC_INITFUNCTION=org.thingsboard.server.dao.TimescaleSqlInitializer::initDb
+spring.datasource.url=jdbc:tc:tbtimescaledb:latest-pg18:///thingsboard?TC_DAEMON=true&TC_TMPFS=/testtmpfs:rw&?TC_INITFUNCTION=org.thingsboard.server.dao.TimescaleSqlInitializer::initDb
 spring.datasource.driverClassName=org.testcontainers.jdbc.ContainerDatabaseDriver
 spring.datasource.hikari.maximumPoolSize = 50