Add templates for mariadb, postgres, and valkey

.templates/mariadb.yml

@@ -0,0 +1,21 @@
+services:
+  db:
+    container_name: db
+    image: docker.io/library/mariadb:11.8.2
+    restart: unless-stopped
+    command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW --innodb-file-per-table=1 --skip-innodb-read-only-compressed
+    environment:
+      - MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}
+      - MYSQL_USER=${MYSQL_USER}
+      - MYSQL_PASSWORD=${MYSQL_PASSWORD}
+      - MYSQL_DATABASE=${MYSQL_DATABASE}
+    volumes:
+      - ${APPDATA_PATH}//db:/var/lib/mysql
+    ports:
+      - ${DB_PORT}:3306
+    healthcheck:
+      test: ["CMD", "healthcheck.sh", "--connect", "--innodb_initialized"]
+      interval: 10s
+      timeout: 5s
+      retries: 3
+      start_period: 10s