Add templates for mariadb, postgres, and valkey

.templates/valkey.yml

@@ -0,0 +1,16 @@
+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