Add dockerfile and build ci

.github/workflows/build-images.yaml

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+name: build-images
+
+on:
+  push:
+    tags:
+      - "*"
+jobs:
+  arc-sidecar:
+    runs-on: ubuntu-latest
+    #env:
+    #  DOCKER_TARGET_PLATFORM: linux/arm64
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set env
+        run: echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - 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.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Get Repo Owner
+        id: get_repo_owner
+        run: echo ::set-output name=repo_owner::$(echo ${{ github.repository_owner }} | tr '[:upper:]' '[:lower:]')
+      - name: Build container base image
+        uses: docker/build-push-action@v5
+        with:
+          context: ./
+          outputs: "type=registry,push=true"
+          tags: |
+            ghcr.io/${{ steps.get_repo_owner.outputs.repo_owner }}/htcondor-sidecar:${{ env.RELEASE_VERSION }}
+            ghcr.io/${{ steps.get_repo_owner.outputs.repo_owner }}/htcondor-sidecar:latest
+          file: ./docker/Dockerfile
+          platforms: linux/amd64, linux/arm64

docker/Dockerfile

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+FROM htcondor/mini:9.0.17-el7
+
+RUN pip3 install pyyaml
+
+COPY handles.py /utils/handles.py
+COPY SidecarConfig.yaml /utils/SidecarConfig.yaml
+RUN touch /utils/condor_config
+RUN mkdir /utils/.knoc
+
+WORKDIR /utils
+
+CMD ["/bin/sh", "-c", "/start.sh & python3 handles.py"]