Initial Real-ESRGAN API project setup

.gitea/workflows/README.md

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+# Gitea Workflows Configuration
+
+This directory contains Gitea CI/CD workflow definitions.
+
+## build.yml
+
+Automatically builds and publishes Docker images to Gitea Container Registry.
+
+### Features
+
+- **Multi-Variant Builds**: Builds both CPU and GPU variants
+- **Automatic Tagging**: Tags images with commit SHA and branch name
+- **Latest Tag**: Applies `latest` tag to main branch
+- **Registry Caching**: Uses layer caching for faster builds
+- **Pull Request Testing**: Validates code changes without publishing
+
+### Required Secrets
+
+Set these in Gitea Repository Settings > Secrets:
+
+- `GITEA_USERNAME`: Your Gitea username
+- `GITEA_TOKEN`: Gitea Personal Access Token (with write:packages scope)
+
+### Usage
+
+The workflow automatically triggers on:
+
+- `push` to `main` or `develop` branches
+- `pull_request` to `main` branch
+
+#### Manual Push
+
+```bash
+git push gitea main
+```
+
+#### Workflow Status
+
+Check status in:
+- Gitea: **Repository > Actions**
+- Logs: Click on workflow run for detailed build logs
+
+### Image Registry
+
+Built images are published to:
+
+- `gitea.example.com/realesrgan-api:latest-cpu`
+- `gitea.example.com/realesrgan-api:latest-gpu`
+- `gitea.example.com/realesrgan-api:{COMMIT_SHA}-cpu`
+- `gitea.example.com/realesrgan-api:{COMMIT_SHA}-gpu`