Add build docker image workflow

.github/dependabot.yml

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+version: 2
+updates:
+  # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflows/build_docker_image.yml

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+name: Build docker image
+
+on:
+  push:
+    branches:
+      - 'main'
+
+jobs:
+  Build-Docker-Image:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v4
+
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - id: repository_name
+        uses: ASzc/change-string-case-action@v5
+        with:
+          string: ${{ github.repository }}
+
+      -
+        name: Login to ghcr.io
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      -
+        name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v5
+        env:
+          IMAGE: ${{ steps.repository_name.outputs.lowercase }}
+        with:
+          push: true
+          platforms: linux/amd64
+          tags: ghcr.io/${{ env.IMAGE }}:latest
+          context: .
+          file: ./docker/build.dockerfile
+
+      # -
+      #   name: Invoke deployment hook
+      #   uses: joelwmale/webhook-action@master
+      #   with:
+      #     url: ${{ secrets.WEBHOOK_URL }}

docker/build.dockerfile

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+FROM rust:bullseye AS builder
+
+WORKDIR /app
+
+COPY . .
+
+RUN cargo build --release --bin ionos-ddns
+
+
+FROM debian:bullseye-slim
+
+RUN apt-get update \
+    && apt-get install -y openssl ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN update-ca-certificates
+
+WORKDIR /app
+
+COPY --from=builder /app/target/release/ionos-ddns /usr/local/bin
+ENTRYPOINT ["/usr/local/bin/ionos-ddns"]