feat: add Dockerfile (#8)

* feat: add Dockerfile

* doc: add using with Docker in README

* Update README.md

---------

Co-authored-by: Michael <161408495+michaelien@users.noreply.github.com>

Dockerfile

@@ -0,0 +1,17 @@
+# Build stage
+FROM golang:1.22.2-alpine AS builder
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+COPY . .
+RUN CGO_ENABLED=0 go build -o memogram ./bin/memogram
+RUN chmod +x memogram
+
+# Run stage
+FROM alpine:latest
+WORKDIR /app
+ENV SERVER_ADDR=dns:localhost:5230
+ENV BOT_TOKEN=your_telegram_bot_token
+COPY .env.example .env
+COPY --from=builder /app/memogram .
+CMD ["./memogram"]

README.md

@@ -26,6 +26,8 @@ The `SERVER_ADDR` should be a gRPC server address that the Memos is running on.
 
 ### Starting the Service
 
+#### Starting with binary
+
 1. Download and extract the released binary file;
 2. Create a `.env` file in the same directory as the binary file;
 3. Run the executable in the terminal:
@@ -36,6 +38,22 @@ The `SERVER_ADDR` should be a gRPC server address that the Memos is running on.
 
 4. Once the bot is running, you can interact with it via your Telegram bot.
 
+#### Starting with Docker
+
+Or you can start the service with Docker:
+
+1.  Build the Docker image: `docker build -t memogram .`
+2.  Run the Docker container with the required environment variables:
+
+    ```sh
+    docker run -d --name memogram \
+    -e SERVER_ADDR=dns:localhost:5230 \
+    -e BOT_TOKEN=your_telegram_bot_token \
+    memogram
+    ```
+
+3.  The Memogram service should now be running inside the Docker container. You can interact with it via your Telegram bot.
+
 ### Interaction Commands
 
 - `/start <access_token>`: Start the bot with your Memos access token.