fix(ci): trigger workflow on main branch to enable :latest tag

Changes:
- Create Gitea workflow for ai-stack-deployer
- Trigger on main branch (default branch)
- Use oussamadouhou + REGISTRY_TOKEN for authentication
- Build from ./Dockerfile

This enables :latest tag creation via {{is_default_branch}}.

Tags created:
- git.app.flexinit.nl/oussamadouhou/ai-stack-deployer:latest
- git.app.flexinit.nl/oussamadouhou/ai-stack-deployer:<sha>

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.dockerignore

@@ -0,0 +1,57 @@
+# Dependencies
+node_modules
+
+# Environment files
+.env
+.env.local
+.env.*.local
+
+# Git
+.git
+.gitignore
+
+# Documentation
+*.md
+!README.md
+
+# IDE
+.vscode
+.idea
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Testing
+coverage
+.nyc_output
+
+# Temporary files
+tmp
+temp
+*.tmp
+
+# Docker
+Dockerfile
+docker-compose*.yml
+.dockerignore
+
+# CI/CD
+.github
+.gitlab-ci.yml
+
+# Scripts
+scripts
+
+# Claude sessions
+.claude