refactor: Bundle cdn-location

[mondoreale]

Note

Looks like #3332 is too much at once - lotta failing tests and what not. I will deal with each of them packages separately.

This pull request updates the build and packaging setup for the @streamr/cdn-location package. The main improvements are the introduction of a Rollup build process to generate both CommonJS and ES module outputs, refined output file structure, and enhancements to the development workflow.

Changes

Build system and packaging improvements:

• Added a new rollup.config.mts file to configure Rollup to bundle the package into both ES module (exports.js) and CommonJS (exports.cjs) formats, as well as to generate type declarations (exports.d.ts). This setup also marks dependencies as external to avoid bundling them.
• Updated package.json to point to the new output files, specify both main (CommonJS) and module (ESM) entry points, and restrict the published files to only the relevant outputs.
• Added Rollup and related plugins (@rollup/plugin-node-resolve, rollup-plugin-dts, tsx) as dev dependencies, and introduced a postbuild script to run Rollup after TypeScript compilation. Also added a prebuild script to clean up build info files.
• Updated tsconfig.json to use "module": "preserve" and "moduleResolution": "bundler" for better compatibility with the new bundling process.

Monorepo integration:

• Included @streamr/cdn-location in the monorepo bootstrap process in the root Dockerfile.node, ensuring it is built alongside other packages.

[Copilot]

Pull request overview

This PR refactors the @streamr/cdn-location package to introduce a Rollup-based build process that generates both CommonJS and ES module outputs, aligning it with other bundled packages in the monorepo like @streamr/autocertifier-client and @streamr/utils.

Key Changes:

• Introduced Rollup bundling configuration to produce ESM (exports.js) and CJS (exports.cjs) outputs with type declarations
• Updated package entry points and build scripts to support the new bundled output structure
• Added the package to the Docker build process to ensure proper monorepo integration

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/cdn-location/rollup.config.mts	New Rollup configuration for bundling the package into ESM and CJS formats with type declarations, following the pattern used in autocertifier-client
packages/cdn-location/package.json	Updated entry points (main, module, types), added Rollup-related dev dependencies, and introduced prebuild/postbuild scripts for the new build process
packages/cdn-location/tsconfig.json	Added TypeScript compiler options (module: preserve, moduleResolution: bundler) to support the bundling workflow
package-lock.json	Added dependency entries for Rollup, rimraf, tsx, and related packages required for the new build process
Dockerfile.node	Included cdn-location in the Docker build sequence after its dependency (utils) and before packages that depend on it (dht)

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