fix: add nightly tag for main branch Docker builds

- Add :nightly tag when pushing to main branch for both images
- Keep :latest tag only for version tags (v*.*.*)
- Add full semantic versioning support to claudecode image
- Remove -staging suffix approach from claudecode image

This fixes the "tag is needed when pushing to registry" error that
occurs when pushing to main branch without any valid tags.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

.github/workflows/docker-publish.yml

@@ -51,7 +51,10 @@ jobs:
             type=semver,pattern={{version}}
             type=semver,pattern={{major}}.{{minor}}
             type=semver,pattern={{major}}
+            # Latest tag for version tags
             type=raw,value=latest,enable=${{ startsWith(github.ref, 'refs/tags/v') }}
+            # Nightly tag for main branch pushes
+            type=raw,value=nightly,enable=${{ github.ref == 'refs/heads/main' }}
 
       - name: Build and push Docker image
         uses: docker/build-push-action@v6
@@ -106,9 +109,13 @@ jobs:
         with:
           images: ${{ env.DOCKER_HUB_ORGANIZATION }}/claudecode
           tags: |
-            type=ref,event=branch,suffix=-staging
             type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            # Latest tag for version tags
             type=raw,value=latest,enable=${{ startsWith(github.ref, 'refs/tags/v') }}
+            # Nightly tag for main branch pushes
+            type=raw,value=nightly,enable=${{ github.ref == 'refs/heads/main' }}
 
       - name: Build and push Claude Code Docker image
         uses: docker/build-push-action@v6