build: add docker setup

Dockerfile

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+FROM golang:1.25.3-alpine AS builder
+
+WORKDIR /app
+COPY .  .
+
+# Build
+RUN go mod download
+RUN CGO_ENABLED=0 GOOS=linux go build -a -o main ./cmd/server
+###########
+
+FROM alpine:3.22.2
+
+RUN apk --no-cache add ca-certificates
+WORKDIR /root/
+
+# Copy the pre-built binary
+COPY --from=builder /app/main .
+
+EXPOSE 8080
+CMD ["./main"]

docker-compose.yml

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+services:
+  go-app:
+    build: .
+    container_name: agenda-web-go
+    environment:
+      - DB_NAME=${DB_NAME}
+      - DB_USER=${DB_USER}
+      - DB_PASSWORD=${DB_PASSWORD}
+      - DB_HOST=${DB_HOST}
+      - DB_PORT=${DB_PORT}
+      - ALLOWED_ORIGIN=${ALLOWED_ORIGIN}
+    networks:
+      - db-network
+    volumes:
+      #- ./cache:/root/.cache
+      - ./:/app
+    restart: unless-stopped
+    ports:
+      - 3005:8080
+
+networks:
+  db-network:
+    external: true