chore: new release action

[pablocampogo]

Summary

• Moved Docker image build and push from the deployments repo into the canopy repo, eliminating the cross-repo webhook dispatch to canopy-network/deployments
• Added Dockerfiles and entrypoint.sh to .docker/auto-update/ for the main image and all 5 plugin variants (Go, Python, TypeScript, Kotlin, C#)
• Each Docker image (main + 5 plugins) builds and pushes as an independent concurrent job, all gated behind the GitHub release job
• Plugin images are tagged with both a versioned suffix (<plugin>-<version>) and a latest suffix (<plugin>-latest)

Docker Hub Tags

Image	Version Tag	Latest Tag
Main	canopynetwork/canopy:<version>	canopynetwork/canopy:latest
Go	canopynetwork/canopy:go-<version>	canopynetwork/canopy:go-latest
Python	canopynetwork/canopy:python-<version>	canopynetwork/canopy:python-latest
TypeScript	canopynetwork/canopy:typescript-<version>	canopynetwork/canopy:typescript-latest
Kotlin	canopynetwork/canopy:kotlin-<version>	canopynetwork/canopy:kotlin-latest
C#	canopynetwork/canopy:csharp-<version>	canopynetwork/canopy:csharp-latest