Setup docker for production and development

Change ./init.sh to be an executable then run it.

The default inner container ports are as followed:
- Postgres: 5432:5432
- Backend: 3001:3000
- Frontend: 3000:3000

- Frontend dev: 8000

The backend image needs to be built:

docker compose up -d --build

backend/Dockerfile

@@ -0,0 +1,12 @@
+FROM golang:alpine
+
+WORKDIR /app
+
+COPY . .
+
+RUN go mod download
+RUN go mod tidy
+
+RUN go build main.go
+
+CMD ["./main"]