adding gitbackup container

.github/workflows/github-backup.yml

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+on:
+  push:
+    branches: [ master ]
+    paths:
+      - 'github-backup/*'
+      - '.github/workflows/github-backup.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: github-backup/
+          platforms: linux/arm/v7, Linux/amd64, linux/arm64/v8
+          push: true
+          file: github-backup/Dockerfile
+          tags: ghcr.io/sstent/github-backup:latest 
+          

github-backup/Dockerfile

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+FROM alpine:latest
+
+RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing/" >> /etc/apk/repositories 
+
+RUN apk add --no-cache python3 && \
+    python3 -m ensurepip && \
+    rm -r /usr/lib/python*/ensurepip && \
+    pip3 install --upgrade pip setuptools && \
+    if [ ! -e /usr/bin/pip ]; then ln -s pip3 /usr/bin/pip ; fi && \
+    if [[ ! -e /usr/bin/python ]]; then ln -sf /usr/bin/python3 /usr/bin/python; fi 
+RUN pip3 install github-backup
+ENTRYPOINT ["github-backup"]