add docker configuration and gitea workflow for automated image builds

Introduce a multi-stage Dockerfile, docker-compose setup, and a Gitea Actions workflow to automate building and pushing images to the registry. The configuration includes an entrypoint script for persistent logging and a .dockerignore to optimize the build context.

docker-compose.yml

@@ -0,0 +1,25 @@
+services:
+  api:
+    build: .
+    restart: unless-stopped
+    ports:
+      - "${PORT:-8080}:8080"
+    environment:
+      PORT: ${PORT:-8080}
+      DB_DSN: ${DB_DSN}
+      DATABASE_NAME: ${DATABASE_NAME}
+      API_KEY: ${API_KEY}
+      ADMIN_KEY: ${ADMIN_KEY}
+      DB_MAX_OPEN_CONNS: ${DB_MAX_OPEN_CONNS:-25}
+      DB_MAX_IDLE_CONNS: ${DB_MAX_IDLE_CONNS:-5}
+      DB_CONN_MAX_LIFETIME: ${DB_CONN_MAX_LIFETIME:-5}
+    volumes:
+      - logs:/logs
+    logging:
+      driver: "json-file"
+      options:
+        max-size: "10m"
+        max-file: "5"
+
+volumes:
+  logs: