We need to embed signatures files at build times to allow us to verify the artifacts in the work in #19222. The Elastic Agent is built by the release manager which also builds all the other artifacts.

We need to change the order of operation.

• build filebeat/create signature.
• build metricbeat/create signature file
• build endpoint/create signature file.
• build Elastic-Agent with the right "archives" and the right signature files.

To do this we could have at parameters at build times to specify what needs to be embedded.