Add dockerfile for matching service

Author: UnwilledTangent

apps/matching-service/.env.example

@@ -1,4 +1,9 @@
 PORT=8081
 MATCH_TIMEOUT=10
 JWT_SECRET=you-can-replace-this-with-your-own-secret
-REDIS_URL=localhost:6379
+
+# if you are NOT USING docker, use the below url
+REDIS_URL=localhost:6379
+
+# if you are USING docker, use the below url
+# REDIS_URL=redis-container:6379

apps/matching-service/Dockerfile

@@ -1,27 +1,18 @@
-# Stage 1: Build Go Application
-
-FROM golang:1.23 AS builder
+FROM golang:1.23
 
 WORKDIR /usr/src/app
 
+# pre-copy/cache go.mod for pre-downloading dependencies and only redownloading them in subsequent builds if they change
 COPY go.mod go.sum ./
 
 RUN go mod tidy && go mod download && go mod verify
 
-# Copy the .env file to the final image
 COPY .env /usr/src/app/.env
 
 COPY . .
 
 RUN go build -v -o /usr/local/bin/app ./main.go
 
-# Stage 2: Setup Redis and combine with Go
-FROM redis:latest
-
-# Copy the built Go binary from the builder stage
-COPY --from=builder /usr/local/bin/app /usr/local/bin/app
-
-EXPOSE 8081 6379
+EXPOSE 8081
 
-# Start both Redis and the Go application
-CMD ["sh", "-c", "redis-server & app; wait"]
+CMD ["app"]

apps/matching-service/README.md

@@ -27,7 +27,7 @@ go mod tidy
 - `PORT`: Specifies the port for the WebSocket server. Default is `8081`.
 - `JWT_SECRET`: The secret key used to verify JWT tokens.
 - `MATCH_TIMEOUT`: The time in seconds to wait for a match before timing out.
-- `REDIS_URL`: The URL for the Redis server. Default is `localhost:6379`.
+- `REDIS_URL`: The URL for the Redis server. Default is `localhost:6379`. If you are using docker, use `redis-container:6379`
 
 4. Start a local redis server:
 
@@ -123,12 +123,22 @@ You can open one instance of the HTML file in multiple tabs to simulate multiple
 
 ## Running the Application via Docker
 
+Before running the following commands, ensure that the URL for the Redis server in `.env` file has been changed to `redis-container:6379`
+
 To run the application via Docker, run the following command:
 
 ```bash
-docker build -t matching-service .
+docker build -f Dockerfile -t match-go-app .
+```
+
+```bash
+docker network create redis-go-network
+```
+
+```bash
+docker run -d --name redis-container --network redis-go-network redis
 ```
 
 ```bash
-docker run -d -p 8081:8081 -p 6379:6379 --name matching-service-container matching-service
+docker run -d -p 8081:8081 --name go-app-container --network redis-go-network match-go-app
 ```