Add Dockerfiles for the 17 sample MCP servers

* add Dockerfiles and update README.md definitions

src/github/Dockerfile

@@ -0,0 +1,19 @@
+FROM node:22.12-alpine as builder
+
+# Must be entire project because `prepare` script is run during `npm install` and requires all files.
+COPY src/github /app
+COPY tsconfig.json /tsconfig.json
+
+WORKDIR /app
+
+RUN --mount=type=cache,target=/root/.npm npm install
+
+FROM node:22-alpine AS release
+
+COPY --from=builder /app/dist /app
+
+ENV NODE_ENV=production
+
+WORKDIR /app
+
+CMD ["node", "dist/index.js"]