feat: add gitea docker configuration

.env.example

@@ -0,0 +1,3 @@
+GITEA_DB_USER=gitea_user
+GITEA_DB_PASSWORD=your_secure_password_here
+

docker-compose.yml

@@ -0,0 +1,53 @@
+version: '3'
+
+services:
+  gitea:
+    image: gitea/gitea:latest
+    container_name: gitea
+    environment:
+      - USER_UID=1000
+      - USER_GID=1000
+      - GITEA__database__DB_TYPE=postgres
+      - GITEA__database__HOST=db:5432
+      - GITEA__database__NAME=gitea
+      - GITEA__database__USER_secure=${GITEA_DB_USER}
+      - GITEA__database__PASSWD_secure=${GITEA_DB_PASSWORD}
+      - GITEA__server__DOMAIN=gitea.sigd.net
+      - GITEA__server__ROOT_URL=https://gitea.sigd.net/
+      - GITEA__security__INSTALL_LOCK=true
+    volumes:
+      - /docker/gitea/data:/data
+      - /docker/gitea/config:/etc/gitea
+      - /etc/timezone:/etc/timezone:ro
+      - /etc/localtime:/etc/localtime:ro
+    ports:
+      - "3000:3000"
+    depends_on:
+      db:
+        condition: service_healthy
+    restart: always
+    networks:
+      - gitea_network
+
+  db:
+    image: postgres:15-alpine
+    container_name: gitea-db
+    environment:
+      - POSTGRES_USER=${GITEA_DB_USER}
+      - POSTGRES_PASSWORD=${GITEA_DB_PASSWORD}
+      - POSTGRES_DB=gitea
+    volumes:
+      - /docker/gitea/postgres:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${GITEA_DB_USER}"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    restart: always
+    networks:
+      - gitea_network
+
+networks:
+  gitea_network:
+    driver: bridge
+