Add Docker support with Dockerfile, entrypoint script, and CI workflows

- Introduced a Dockerfile for building the application with Go and Node.js dependencies.
- Added a docker-entrypoint.sh script to manage container execution.
- Created a .dockerignore file to exclude unnecessary files from the Docker context.
- Updated Makefile to include a new target for building the Docker image.
- Added CI workflows for testing, formatting, and releasing artifacts in Gitea.

.dockerignore

@@ -0,0 +1,7 @@
+.git
+.gitea
+agent-transcripts
+bin
+data
+node_modules
+web/ui/node_modules