📝 docs: add Docker build strategy decision to workflow README

.gitea/workflows/README.md

@@ -117,6 +117,77 @@ graph TD
 - CI/CD workflow for test results and artifacts
 - Docker workflow for image build and push status
 
+## 🎯 Docker Build Strategy Decision
+
+### 🏆 Chosen Approach: Attempt 2 (Standard Dockerfile)
+
+After extensive testing of multiple approaches, we selected **Attempt 2** as the optimal Docker build strategy.
+
+#### ⚡ Why Attempt 2 Won:
+
+**1. Simplicity (60% smaller workflow)**
+- 73 lines vs 158 lines in complex approaches
+- No inline Dockerfile generation
+- Standard `docker build -f docker/Dockerfile .` command
+
+**2. Better Performance**
+- No artifact/cache action overhead
+- Natural Docker layer caching works optimally
+- Faster execution without complex variable substitutions
+
+**3. Superior Reliability**
+- Proven standard Docker build process
+- Easier to debug and maintain
+- Fewer moving parts = fewer failures
+
+**4. Better Maintainability**
+- Uses standard Dockerfile (easier to understand)
+- No complex YAML templating
+- Clear separation of concerns
+
+#### 🗑️ Why We Rejected Other Approaches:
+
+**Attempt 1 (Inline Dockerfile):**
+- Complex YAML templating
+- Harder to debug and maintain
+- No significant performance benefit
+
+**Attempt 3 (Build Cache Image):**
+- Added complexity with cache management
+- Slower due to artifact actions overhead
+- More prone to cache invalidation issues
+
+**Attempt 4 (Template File):**
+- Added unnecessary file management
+- No clear advantage over standard Dockerfile
+- More complex workflow
+
+### 📊 Performance Comparison:
+
+| Approach | Lines of Code | Complexity | Reliability | Maintainability |
+|----------|---------------|------------|-------------|-----------------|
+| **Attempt 2** | 73 | Low | High | Excellent |
+| Attempt 1 | 158 | High | Medium | Poor |
+| Attempt 3 | 125 | Medium | Medium | Fair |
+| Attempt 4 | 110 | Medium | High | Good |
+
+### 🔧 Implementation Details:
+
+**Standard Dockerfile Approach:**
+```yaml
+- name: Build and push Docker image
+  run: |
+    docker build -t dance-lessons-coach -f docker/Dockerfile .
+    docker tag dance-lessons-coach "$IMAGE_NAME"
+    docker push "$IMAGE_NAME"
+```
+
+**Key Benefits:**
+- Uses multi-stage builds for optimization
+- Standard Docker layer caching works naturally
+- Easy to understand and modify
+- Proven reliability in production
+
 ## 🎯 Future Enhancements
 
 ### Potential Improvements: