Add templates for mariadb, postgres, and valkey

.templates/mariadb.yml

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+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

.templates/postgres.yml

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+services:
+  db:
+    container_name: db
+    image: docker.io/library/postgres:17.5
+    restart: unless-stopped
+    environment:
+      - POSTGRES_USER=${POSTGRES_USER}
+      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
+      - POSTGRES_DB=${POSTGRES_DB}
+    volumes:
+      - ${APPDATA_PATH}//db:/var/lib/postgresql/data
+    ports:
+      - ${DB_PORT}:5432
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -d ${POSTGRES_DB} -U ${POSTGRES_USER}"]
+      interval: 10s
+      timeout: 5s
+      retries: 3
+      start_period: 10s

.templates/valkey.yml

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+services:
+  valkey:
+    container_name: valkey
+    image: docker.io/valkey/valkey:8.1.3
+    restart: unless-stopped
+    command: valkey-server --save 60 1 --requirepass ${VALKEY_PASSWORD}
+    volumes:
+      - ${APPDATA_PATH}//valkey:/data
+    ports:
+      - ${VALKEY_PORT}:6379
+    healthcheck:
+      test: ["CMD-SHELL", "echo 'auth ${VALKEY_PASSWORD}\nping' | valkey-cli | grep PONG"]
+      interval: 10s
+      timeout: 5s
+      retries: 3
+      start_period: 10s