add ubuntu with python3

.github/workflows/ubuntu-python3.yml

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+on:
+  push:
+    branches: [ master ]
+    paths:
+      - 'ubuntu-python3/*'
+      - '.github/workflows/ubuntu-python3.yml'
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+        
+      -
+        name: Log into registry
+        uses: docker/login-action@28218f9b04b4f3f62068d7b6ce6ca5b26e35336c
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      -
+        name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: rsync/
+          platforms: linux/arm/v7, Linux/amd64, linux/arm64/v8
+          push: true
+          tags: ghcr.io/sstent/ubuntu-python3:latest 
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          

ubuntu-python3/Dockerfile

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+FROM ubuntu:23.10
+
+RUN apt-get update; apt install python3 python3-pip
+ENTRYPOINT ["/usr/bin/bash"]