Add gitea configuration

gitea/.env

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+GITEA_DATA_LOCATION=/mnt/data/gitea/data
+GITEA_DB_LOCATION=/mnt/data/gitea/db

gitea/docker-compose.yml

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+version: '2'
+services:
+  web:
+    image: gitea/gitea
+    volumes:
+      - ${GITEA_DATA_LOCATION}:/data
+    ports:
+      - "3000:3000"
+      - "55522:22"
+    depends_on:
+      - db
+    env_file:
+      - ./reverse_proxy.env.secret
+      - ./gitea_conf.env.secret
+    environment:
+      - VIRTUAL_PORT=3000
+    restart: always
+    networks:
+      - proxy_network
+      - gitea_network
+  db:
+    image: mariadb:10
+    restart: always
+    env_file:
+      - ./db.env.secret
+    environment:
+      - MYSQL_DATABASE=gitea
+      - MYSQL_USER=gitea
+    volumes:
+      - ${GITEA_DB_LOCATION}:/var/lib/mysql
+    networks:
+      - gitea_network
+
+networks:
+  gitea_network:
+  proxy_network:
+    external:
+      name: nginx_proxy_network