Add Gitea Actions CI/CD for automated Docker builds

- Add .gitea/workflows/docker.yml: builds and pushes Docker image on Git tags
  with semantic versioning (v0.1.0 → tags 0.1.0, 0.1, latest)
- Add .dockerignore to optimize Docker build context
- Document release process in docs/DEVELOPMENT.md
- Update CHANGELOG.md with v0.1.0 release and Unreleased CI/CD entry

Required Gitea secrets: REGISTRY_USERNAME, REGISTRY_PASSWORD

Co-authored-by: Junie <junie@jetbrains.com>

.dockerignore

@@ -1,9 +1,29 @@
-
+# Docker build context exclusions
 .git
+.github
+.gitea
+docs
+*.md
+!.markdownlint.yaml
 .idea
-**/.idea
-**/node_modules
-
-**/dist
-**/.gradle
-**/.angular
+*.iml
+node_modules
+.gradle
+build
+dist
+.DS_Store
+*.log
+*.tmp
+*.swp
+*~
+# Frontend build artifacts (built inside Docker)
+frontend/dist
+frontend/.angular
+# Backend build artifacts (built inside Docker)
+backend/build
+backend/libs
+# Test reports
+backend/build/reports
+# Secrets
+.env
+.env.*

.gitea/workflows/docker.yml

@@ -0,0 +1,50 @@
+name: Docker Build and Push
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+env:
+  REGISTRY: gitea.jambotron.com
+  IMAGE_NAME: liosha84/htop-web
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    container:
+      image: catthehacker/ubuntu:act-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Extract version from tag
+        id: version
+        run: |
+          # Remove 'v' prefix from tag (e.g., v0.1.0 → 0.1.0)
+          VERSION=$(echo "${{ gitea.ref }}" | sed 's|refs/tags/v||')
+          echo "version=${VERSION}" >> "${GITEA_OUTPUT}"
+
+          # Extract major.minor for minor tag (e.g., 0.1.0 → 0.1)
+          MINOR=$(echo "${VERSION}" | sed 's/\.[0-9]*$//')
+          echo "minor=${MINOR}" >> "${GITEA_OUTPUT}"
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Gitea Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: |
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.version.outputs.version }}
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ steps.version.outputs.minor }}
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest

CHANGELOG.md

@@ -6,6 +6,12 @@ This project has not yet established a versioned changelog. Add entries as relea
 
 ## Unreleased
 
+- **CI/CD with Gitea Actions** — automated Docker image build and push on Git tags. Each release produces three tags: full version (`0.2.0`), minor version (`0.2`), and `latest`. Configure `REGISTRY_USERNAME` and `REGISTRY_PASSWORD` secrets in Gitea repository settings.
+- **Docker build optimization** — added `.dockerignore` to exclude unnecessary files from the build context, reducing build time and image size.
+- **Release documentation** — added detailed release process guide in `docs/DEVELOPMENT.md` with Semantic Versioning workflow.
+
+## v0.1.0
+
 - **Multi-stage Docker build** — the Dockerfile now compiles both the Angular frontend and Spring Boot backend inside Docker using three stages (Node.js → Gradle → JRE). Build the entire application with a single `docker build` command — no local Java or Node.js required.
 - **Security hardening** — replaced full host root mount (`/:/host/root:ro`) with specific directory mounts (`/proc`, `/sys`, `/etc/hostname`, `/etc/os-release`, `/var`, `/home`, `/opt`, `/tmp`, `/srv`, `/usr`) to minimize the attack surface.
 - **Host metrics consistency** — `LinuxMemoryService` and `CpuDetailsService` now read host metrics from `/host/proc` instead of container metrics from OSHI.

docs/DEVELOPMENT.md

@@ -91,6 +91,59 @@ docker run -d \
   htop-web
 ```
 
+## Release process
+
+### Prerequisites
+
+- Gitea Actions runner must be configured and running.
+- Repository secrets `REGISTRY_USERNAME` and `REGISTRY_PASSWORD` must be set in **Settings → Secrets** of the Gitea repository. These credentials are used to authenticate with the Gitea Container Registry.
+
+### Creating a release
+
+1. **Update `CHANGELOG.md`** with changes for the new version.
+
+2. **Commit and push** your changes:
+
+   ```bash
+   git add -A
+   git commit -m "Prepare release v0.2.0"
+   git push origin master
+   ```
+
+3. **Create and push a Git tag** with Semantic Versioning:
+
+   ```bash
+   git tag -a v0.2.0 -m "Release v0.2.0: new features and fixes"
+   git push origin v0.2.0
+   ```
+
+4. **Gitea Actions** will automatically:
+   - Build the Docker image using the multi-stage Dockerfile
+   - Tag it with the version (`0.2.0`), minor version (`0.2`), and `latest`
+   - Push all three tags to the Gitea Container Registry
+
+### Docker image tags
+
+Each release produces three Docker image tags:
+
+| Tag | Example | Description |
+|-----|---------|-------------|
+| Full version | `gitea.jambotron.com/liosha84/htop-web:0.2.0` | Exact version, use in production |
+| Minor version | `gitea.jambotron.com/liosha84/htop-web:0.2` | Latest patch of 0.2.x |
+| Latest | `gitea.jambotron.com/liosha84/htop-web:latest` | Most recent stable release |
+
+### Using a specific version in production
+
+In `docker-compose.yml`, always pin to a specific version:
+
+```yaml
+services:
+  htop-web:
+    image: gitea.jambotron.com/liosha84/htop-web:0.2.0
+```
+
+Avoid using `:latest` in production — it makes rollbacks impossible and breaks reproducibility.
+
 ## Contribution guidelines
 
 - Keep changes focused and reviewable.