Merge pull request #2 from sapcc/refactor-go-netbox

[refactoring] generic check command with filtering support

Author: businessbean

.dockerignore

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-.git/
 .idea/
+.vscode/
+.DS_Store

.github/CODEOWNERS

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+* @SchwarzM @businessbean

.github/workflows/README.md

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+# GitHub Actions Workflows Documentation
+
+This directory contains GitHub Actions workflows for CI/CD automation of the `concourse-netbox-resource` project. The workflows provide code validation, image building and release management.
+
+## TOC
+- [GitHub Actions Workflows Documentation](#github-actions-workflows-documentation)
+  - [TOC](#toc)
+  - [Overview](#overview)
+  - [Workflow Details](#workflow-details)
+    - [Validate Code Workflow](#validate-code-workflow)
+      - [Jobs and Steps](#jobs-and-steps)
+    - [Build Image Workflow](#build-image-workflow)
+      - [Jobs and Steps](#jobs-and-steps-1)
+    - [Publish Release Workflow](#publish-release-workflow)
+      - [Jobs and Steps](#jobs-and-steps-2)
+  - [Environment Variables](#environment-variables)
+  - [Container Images](#container-images)
+  - [Workflow vizualization](#workflow-vizualization)
+  - [Release Process](#release-process)
+  - [Dependencies](#dependencies)
+
+## Overview
+
+The project uses three main workflows that work together to ensure code quality and automate releases:
+
+| | |
+| :--- | :--- |
+| [Validate Code workflow](#validate-code-workflow) | Validates code quality on feature branches |
+| [Build Image workflow](#build-image-workflow) | Builds draft releases when tags are pushed |
+| [Publish Release workflow](#publish-release-workflow) | Publishes final releases when merged to master |
+
+## Workflow Details
+
+### Validate Code Workflow
+
+| | |
+| :--- | :--- |
+| **File** | [`validate-code.yaml`](./validate-code.yaml) |
+| **Trigger** | Push to any branch except `master` |
+| **Purpose** | Ensures code quality by running tests |
+
+#### Jobs and Steps
+- **validateCode:**
+  - Checks out code
+  - Populates environment variables (`GIT_COMMIT`, `GIT_TAG`, `BUILD_DATE`, `LDFLAGS`, `GO_VERSION`)
+  - Sets up Go using the version from [go.mod](../../go.mod)
+  - Runs [golangci-lint](https://github.com/golangci/golangci-lint) for static code analysis
+  - Runs [govulncheck](https://pkg.go.dev/golang.org/x/vuln/cmd/govulncheck) for vulnerability scanning
+  - Executes unit tests and showing the coverage ratio
+  - Builds all three binaries (`check`, `in`, `out`)
+  - Validates that built binaries report correct version information
+
+### Build Image Workflow
+
+| | |
+| :--- | :--- |
+| **File** | [`build-image.yaml`](./build-image.yaml) |
+| **Trigger** | Push to tags matching `v*` pattern |
+| **Purpose** | Creates a draft release pointing to the container image |
+
+#### Jobs and Steps
+- **validateCode:**
+  - same as in [Validate Code Workflow](#validate-code-workflow)
+  - Additional validation to ensure a valid git tag exists
+
+- **buildImage:**
+  - depends on the `validateCode` job
+  - Logs into GitHub Container Registry (GHCR)
+  - Generates Docker metadata with multiple tag strategies:
+    - semantic versioning (`v1.2.3`, `v1.2`)
+    - draft tag
+    - date based
+  - Builds and pushes `linux/amd64` Docker image
+  - Injects build arguments (`GO_VERSION`, `GIT_COMMIT`, `GIT_TAG`, `BUILD_DATE`)
+
+- **createRelease:**
+  - depends on the `buildImage` job
+  - uses [mdq](https://github.com/yshavit/mdq) to extract the relevant changelog section for the tag
+  - Appends Docker pull command to changelog
+  - Creates a **draft** GitHub release with the processed changelog
+
+### Publish Release Workflow
+
+| | |
+| :--- | :--- |
+| **File** | [`publish-release.yaml`](./publish-release.yaml) |
+| **Trigger** | Push to `master` branch |
+| **Purpose** | Publishes the release |
+
+#### Jobs and Steps
+- **buildImage:**
+  - Similar to build-image workflow but with key differences:
+    - Uses `release` tag instead of `draft`
+    - Requires an existing git tag on the commit
+
+- **createRelease:**
+  - depends on the `buildImage` job
+  - Same changelog processing as in the [Build Image workflow](#build-image-workflow)
+  - Removes draft status from the release to publish it
+  - Updates existing releases only if they are unreleased
+
+## Environment Variables
+
+All workflows populate and use these key environment variables:
+
+| Variable | Description | Example |
+|----------|-------------|---------|
+| `GIT_COMMIT` | Current commit SHA | `abc123def456...` |
+| `GIT_TAG` | Git tag pointing to commit | `v1.2.3` or `undefined` |
+| `BUILD_DATE` | UTC timestamp in RFC3339 format | `2024-01-15T10:30:00Z` |
+| `GO_VERSION` | Go version from go.mod | `1.25.1` |
+| `LDFLAGS` | Linker flags for version injection | `-X 'pkg/helper.gitCommit=...'` |
+
+## Container Images
+
+Images are built and pushed to GitHub Container Registry (GHCR) with the following naming pattern:
+
+| | |
+| :--- | :--- |
+| **Draft release** | `ghcr.io/sapcc/concourse-netbox-resource:draft` |
+| **Published release** | `ghcr.io/sapcc/concourse-netbox-resource:release` |
+| **Semantic version** | `ghcr.io/sapcc/concourse-netbox-resource:v1.2.3` |
+| **Timestamp** | `ghcr.io/sapcc/concourse-netbox-resource:YYYYMMDD-hhmmss` |
+| **Latest** | `ghcr.io/sapcc/concourse-netbox-resource:latest` |
+| **Branch** | `ghcr.io/sapcc/concourse-netbox-resource:branch_name` |
+
+## Workflow vizualization
+
+```mermaid
+flowchart TB
+  subgraph "Workflows"
+        subgraph A[validate-code.yaml]
+          D
+        end
+
+        subgraph B[build-image.yaml]
+          E --> F  --> G
+        end
+
+        subgraph C[publish-release.yaml]
+          H --> I
+        end
+    end
+
+    subgraph "Github Registry"
+        F --> CID
+        H --> CIR
+    end
+
+    subgraph "Github Releases"
+        G --> DR
+        I --> PR
+    end
+
+    U --Push to feature branch--> D
+    U --Push version tag--> E
+    U --Approve & Merge PR--> H
+
+    D([validateCode job])
+    E([validateCode job])
+    F([buildImage job])
+    G([createRelease job])
+    H([buildImage job])
+    I([createRelease job])
+    U(Developer)
+    CID@{ shape: div-rect, label: "Draft container image" }
+    CIR@{ shape: div-rect, label: "Published container image" }
+    DR@{ shape: lin-rect, label: "Draft Release" }
+    PR@{ shape: lin-rect, label: "Published Release" }
+```
+
+## Release Process
+
+The complete release process follows this flow:
+
+1. **Development:**
+   - Work on feature branches, all pushes trigger the [Validate Code workflow](#validate-code-workflow)
+2. **Tag Creation:**
+   - Create a version tag (e.g., `v1.2.3`) which triggers the [Build Image workflow](#build-image-workflow)
+     - Builds and pushes container image with draft tags
+     - Creates draft release
+3. **PR Review:**
+   - Review and approve the pull request
+4. **Merge:**
+   - Merge the approved changes to the `master` branch
+   -  this triggers the [Publish Release workflow](#publish-release-workflow)
+        - Builds and pushes container image with release tags
+        - Publishes the release (removes draft status)
+
+## Dependencies
+
+- **Actions Used:**
+  - `actions/[email protected]` - Code checkout
+  - `actions/[email protected]` - Go environment setup
+  - `golangci/[email protected]` - Static analysis
+  - `docker/[email protected]` - Container registry authentication
+  - `docker/[email protected]` - Docker metadata generation
+  - `docker/[email protected]` - Container building and pushing
+  - `ncipollo/[email protected]` - GitHub release creation
+
+- **External Tools:**
+  - [golangci-lint](https://github.com/golangci/golangci-lint) for static code analysis
+  - [govulncheck](https://pkg.go.dev/golang.org/x/vuln/cmd/govulncheck) Go vulnerability scanner
+  - [mdq](https://github.com/yshavit/mdq) Markdown query tool for changelog processing