Add minimal Dockerfile and docker-compose

Dockerfile

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+FROM golang:alpine AS build
+COPY . /app
+WORKDIR /app
+RUN GOOS=linux go build -o matrix-alertmanager-receiver
+
+FROM alpine
+WORKDIR /app
+COPY ./config.toml.sample /etc/matrix-alertmanager-receiver.toml
+COPY --from=build /app/matrix-alertmanager-receiver /app/matrix-alertmanager-receiver
+EXPOSE 9088
+CMD ["./matrix-alertmanager-receiver"]

docker-compose.yml

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+version: "3.3"
+services:
+  matrix-receiver:
+    build: .
+    image: matrix-alertmanager-receiver:latest
+    restart: always
+    volumes:
+      - ./config.toml:/etc/matrix-alertmanager-receiver.toml
+    ports:
+      - 9088:9088