Add Docker build workflow for main branch with manual trigger

- Manual workflow dispatch trigger
- Multi-platform build support
- GHCR registry integration
- Git tag-based versioning
- GitHub Actions cache optimization

.github/workflows/docker-build-main.yml

@@ -0,0 +1,69 @@
+name: Build Docker Image from Main
+
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # Fetch all history for tags
+
+      - name: Get latest tag
+        id: get_tag
+        run: |
+          # Get the latest tag, fallback to commit SHA if no tags exist
+          LATEST_TAG=$(git describe --tags --abbrev=0 2>/dev/null || echo "")
+          if [ -z "$LATEST_TAG" ]; then
+            LATEST_TAG="sha-$(git rev-parse --short HEAD)"
+            echo "No tags found, using commit SHA: $LATEST_TAG"
+          else
+            echo "Latest tag found: $LATEST_TAG"
+          fi
+          echo "tag=$LATEST_TAG" >> $GITHUB_OUTPUT
+          echo "image_tag=$LATEST_TAG" >> $GITHUB_OUTPUT
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=raw,value=${{ steps.get_tag.outputs.tag }}
+            type=raw,value=latest
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+
+      - name: Output image details
+        run: |
+          echo "Docker image built and pushed successfully!"
+          echo "Image tags:"
+          echo "  - ghcr.io/${{ github.repository }}:${{ steps.get_tag.outputs.tag }}"
+          echo "  - ghcr.io/${{ github.repository }}:latest"
+          echo "Latest Git tag used: ${{ steps.get_tag.outputs.tag }}"