Add dockerfile + actions

Signed-off-by: Alexander Soelberg Heidarsson <89837986+alex5517@users.noreply.github.com>

.github/workflows/docker-image.yaml

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+name: Create and publish container for provisioning
+
+on:
+  push:
+    branches:
+      - "main"
+    tags:
+      - "v*.*.*"
+  pull_request:
+    branches:
+      - "main"
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v2
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

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+FROM ubuntu
+
+ARG TARGETARCH
+ARG BAZELISK_VERSION=v1.22.0
+
+COPY --from=docker:27.3.1-cli /usr/local/bin/docker /usr/local/bin/
+RUN apt update && apt install -y git curl gcc python3 xz-utils && rm -rf /var/lib/apt/lists/* && \
+  ln -s /usr/bin/python3 /usr/bin/python && ln -s /usr/bin/pip3 /usr/bin/pip && \
+  curl -L -o /usr/local/bin/bazel https://github.com/bazelbuild/bazelisk/releases/download/${BAZELISK_VERSION}/bazelisk-linux-${TARGETARCH} && chmod +x /usr/local/bin/bazel
+
+WORKDIR /app