adding base container generation

.github/workflows/ghcr-base.yml

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+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+name: build base container image to GitHub Container Registry
+
+on:
+  schedule:
+    - cron: '17 2 1 * *'
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: sarracenia_base
+
+jobs:
+  # Push image to GitHub Packages.
+  # See also https://docs.docker.com/docker-hub/builds/
+  push:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+
+    steps:
+      - name: Checkout branch
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Rename image for publication
+        run: |
+          IMAGE_ID=ghcr.io/${{ github.repository_owner }}/$IMAGE_NAME
+
+          # Change all uppercase to lowercase
+          IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
+          # Strip git ref prefix from version
+          echo IMAGE_ID=$IMAGE_ID >> $GITHUB_ENV
+
+      - name: Build and push
+        uses: docker/[email protected]
+        with:
+          context: ./
+          file: ./Dockerfile_base
+          platforms: linux/arm64, linux/amd64
+          push: true
+          tags: |
+            ${{ env.IMAGE_ID }}:latest

Dockerfile_base

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+FROM ubuntu:latest
+
+MAINTAINER "[email protected]"
+
+ENV TZ="Etc/UTC" \
+    DEBIAN_FRONTEND="noninteractive" \
+    BUILD_PACKAGES="build-essential" 
+
+# deps copied from setup.py requires= ...  
+
+RUN apt-get update ; apt-get install -y python3-amqp python3-appdirs python3-dateparser python3-humanfriendly python3-humanize python3-jsonpickle python3-netifaces python3-paramiko python3-pip python3-psutil python3-watchdog  
+
+# need version >= 1.5.1 to get MQTT v5 support, not in repos of 20.04 ... so get from pip.
+RUN pip3 install paho-mqtt