Add bits for actions-runner (#120)

.github/Dockerfile

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+FROM summerwind/actions-runner:v2.287.1-ubuntu-20.04
+
+ARG build_date=unspecified
+
+LABEL org.opencontainers.image.title="Cisco-SDWAN" \
+      org.opencontainers.image.description="Cisco SDWAN DevOps" \
+      org.opencontainers.image.vendor="Cisco Systems" \
+      org.opencontainers.image.created="${build_date}" \
+      org.opencontainers.image.url="https://github.com/CiscoDevNet/sdwan-devops"
+
+RUN sudo apt-get update && sudo apt-get install -y \
+      sshpass \
+      python3-dev \
+      libffi-dev \
+      libxml2-dev \
+      libxslt-dev \
+      mkisofs
+
+COPY requirements.txt /tmp/requirements.txt
+RUN pip3 install -r /tmp/requirements.txt
+
+WORKDIR /tmp
+ARG terraform_version=0.13.7
+RUN wget --quiet https://releases.hashicorp.com/terraform/${terraform_version}/terraform_${terraform_version}_linux_amd64.zip
+RUN unzip terraform_${terraform_version}_linux_amd64.zip
+RUN sudo mv terraform /usr/bin
+RUN rm terraform_${terraform_version}_linux_amd64.zip
+
+ENV ANSIBLE_HOST_KEY_CHECKING=false
+ENV ANSIBLE_RETRY_FILES_ENABLED=false
+ENV ANSIBLE_SSH_PIPELINING=true
+ENV ANSIBLE_LOCAL_TMP=/tmp
+ENV ANSIBLE_REMOTE_TMP=/tmp
+
+WORKDIR /ansible

.github/workflows/publish-actions-runner.yml

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+name: Docker Publish
+
+on:
+  schedule:
+    - cron: '11 1 * * *'
+  push:
+    branches: [ master ]
+    # Publish semver tags as releases.
+    tags: [ '*.*.*' ]
+  pull_request:
+    branches: [ master ]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}/actions-runner
+
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      # Login against a Docker registry except on PR
+      # https://github.com/docker/login-action
+      - name: Log into registry ${{ env.REGISTRY }}
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@28218f9b04b4f3f62068d7b6ce6ca5b26e35336c
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # Extract metadata (tags, labels) for Docker
+      # https://github.com/docker/metadata-action
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      # Build and push Docker image with Buildx (don't push on PR)
+      # https://github.com/docker/build-push-action
+      - name: Build and push Docker image
+        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
+        with:
+          context: .
+          file: .github/Dockerfile
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}