add Dockerfile

Dockerfile

@@ -0,0 +1,20 @@
+FROM docker.io/node:alpine AS builder
+
+WORKDIR /matritch
+
+COPY package.json yarn.lock ./
+
+RUN yarn install
+
+
+FROM docker.io/node:alpine
+
+VOLUME /data
+WORKDIR /data
+
+USER nobody:nogroup
+
+COPY --from=builder /matritch/node_modules /matritch/node_modules
+COPY index.js /matritch/
+
+CMD ["node", "/matritch/index.js", "-f", "/data/matritch-registration.yaml"]