feat: add Docker build infrastructure for portal-builder

[pcfreak30]

• Add Dockerfile for multi-stage portal builds with xportal
• Add build-portal.sh script for building with plugin manifests
• Add GitHub Actions workflow for automated Docker image builds
• Add JSON schema for plugin manifest validation
• Add comprehensive documentation in README.md
• Configure git-town for branch management
• Update copyright license to Hammer Technologies LLC

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This pull request adds Docker build infrastructure for the portal-builder project. The changes include:

1. Docker Build Configuration:

   • Added a Dockerfile that creates a base build image with Go, xportal, yq, and other necessary tools
   • Includes pre-populated Go module cache for faster builds
   • Configured as a base image pattern for building custom Portal instances

2. CI/CD Pipeline:

   • Added GitHub Actions workflow for automated Docker image building and pushing
   • Supports multi-platform builds (linux/amd64, linux/arm64)
   • Triggers on pushes to develop branch, tags, pull requests, and weekly schedule
   • Includes caching and force-fresh build options

3. Build Tooling:

   • Added build-portal.sh script that handles Portal compilation with custom plugins
   • Supports plugin configuration via YAML manifest or environment variables
   • Includes JSON schema validation for plugin manifests
   • Flexible plugin versioning and Portal version selection

4. Documentation and Configuration:

   • Comprehensive README with usage examples and configuration options
   • Docker ignore file to exclude unnecessary files from builds
   • Git configuration for Git Town workflow
   • Updated license attribution

The infrastructure enables users to build custom Portal instances with specific plugins using Docker multi-stage builds, with support for different Portal versions and plugin configurations.

[kody-ai]

There is a Go version inconsistency between the README.md documentation and the Dockerfile. The README.md incorrectly references 'golang:1.25-alpine' (a non-existent version) in one comment and 'golang:1.21-alpine' in another, while the Dockerfile uses 'golang:1.25-alpine'. This discrepancy will cause Docker build failures and confuse users about the actual build environment.

This issue appears in multiple locations:

• README.md: Lines 8-8
• README.md: Lines 8-8
  Please update the README.md to consistently document the correct Go version used in the Dockerfile. Since Go 1.25 does not exist, both the README.md and Dockerfile should be updated to use a valid Go version like 'golang:1.23-alpine' to ensure build success and documentation accuracy.

- **Pre-configured build environment**: Based on `golang:1.23-alpine`

Prompt for LLM

File README.md:

Line 8:

I found a critical bug in the README.md documentation. The file states that the portal-builder Docker image is based on 'golang:1.25-alpine', but Go version 1.25 does not exist yet (it's scheduled for August 2025 release). The current latest stable Go version is 1.23.x. When users try to build the Docker image using this documentation, Docker will fail to pull the non-existent golang:1.25-alpine image, causing the entire build process to fail. Please fix the version reference to use an actual available Go version like 1.23-alpine.

Suggested Code:

- **Pre-configured build environment**: Based on `golang:1.23-alpine`

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[kody-ai]

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