chore: remove Docker publish GitHub Action

Removing automated Docker Hub publishing workflow to keep the setup simple.
Users can build the Docker image locally with 'docker build -t gemini-mcp-server .'

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

.github/workflows/docker-publish.yml

@@ -1,82 +0,0 @@
-name: Build and Publish Docker Images
-
-on:
-  push:
-    branches:
-      - main
-    tags:
-      - 'v*'
-  pull_request:
-    branches:
-      - main
-  workflow_dispatch:
-
-env:
-  REGISTRY: docker.io
-  IMAGE_NAME: beehiveinnovations/gemini-mcp-server
-
-jobs:
-  build-and-push:
-    runs-on: ubuntu-latest
-    permissions:
-      contents: read
-      packages: write
-
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
-
-      - name: Log in to Docker Hub
-        if: github.event_name != 'pull_request' && github.repository == 'BeehiveInnovations/gemini-mcp-server'
-        uses: docker/login-action@v3
-        with:
-          username: ${{ secrets.DOCKER_USERNAME }}
-          password: ${{ secrets.DOCKER_TOKEN }}
-
-      - name: Extract metadata
-        id: meta
-        uses: docker/metadata-action@v5
-        with:
-          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
-          tags: |
-            type=ref,event=branch
-            type=ref,event=pr
-            type=semver,pattern={{version}}
-            type=semver,pattern={{major}}.{{minor}}
-            type=semver,pattern={{major}}
-            type=raw,value=latest,enable={{is_default_branch}}
-
-      - name: Build and push Docker image
-        uses: docker/build-push-action@v5
-        with:
-          context: .
-          platforms: linux/amd64,linux/arm64
-          push: ${{ github.event_name != 'pull_request' }}
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
-          cache-from: type=gha
-          cache-to: type=gha,mode=max
-
-  test-image:
-    needs: build-and-push
-    if: github.event_name != 'pull_request'
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        platform: [linux/amd64, linux/arm64]
-
-    steps:
-      - name: Set up QEMU
-        uses: docker/setup-qemu-action@v3
-
-      - name: Test Docker image
-        run: |
-          docker run --rm --platform ${{ matrix.platform }} \
-            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.ref_name == 'main' && 'latest' || github.ref_name }} \
-            python -c "import mcp, google.genai; print('Dependencies loaded successfully')"