move pipeline to github native, remove redundant dockerfiles, and add helper actions

.github/workflows/docker.yaml

@@ -0,0 +1,106 @@
+name: varken
+on:
+  schedule:
+    - cron: '0 10 * * *'
+  push:
+    branches: master
+    tags:
+      - 'v*.*.*'
+    paths:
+      - 'varken/**'
+      - 'Varken.py'
+      - 'Dockerfile'
+  pull_request:
+    branches: master
+    paths:
+      - 'varken/**'
+      - 'Varken.py'
+      - 'Dockerfile'
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Use this tag instead of most recent'
+        required: false
+      ignore-existing-tag:
+        description: 'Ignore existing tag if "true"'
+        required: false
+env:
+  IMAGES: ${{ github.repository_owner }}/${{ github.workflow }}
+  PLATFORMS: "linux/amd64,linux/arm64,linux/arm/v7"
+jobs:
+  lint-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Python
+        uses: actions/setup-python@v2
+        with:
+          python-verison: '3.x'
+        run: pip install flake8
+      - name: Lint
+        run: flake8 --max-line-length 120 Varken.py varken/*.py
+  build:
+    runs-on: ubuntu-latest
+    needs: lint-and-test
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Prepare
+        id: prep
+        run: |
+          VERSION=edge
+          if [[ $GITHUB_REF == refs/tags/* ]]; then
+            VERSION=${GITHUB_REF#refs/tags/v}
+          fi
+          if [ "${{ github.event_name }}" = "schedule" ]; then
+            VERSION=nightly
+          fi
+          TAGS="${VERSION}"
+          if [[ $VERSION =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]]; then
+            TAGS="$TAGS,latest"
+          fi
+          echo ::set-output name=version::${VERSION}
+          echo ::set-output name=tags::${TAGS}
+          echo ::set-output name=build_date::$(date -u +'%Y-%m-%dT%H:%M:%SZ')
+          echo ::set-output name=vcs_ref::${GITHUB_SHA::8}
+      - uses: ./.github/actions/docker-target-image-list-action
+        name: Generate Target Images
+        id: gen-tags
+        with:
+          images: ${{ env.IMAGES }}
+          tags: ${{ steps.prep.outputs.tags }}
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+        with:
+          platforms: ${{ env.PLATFORMS }}
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          install: true
+          version: latest
+          driver-opts: image=moby/buildkit:master
+      - name: Docker Multi Login
+        uses: ./.github/actions/docker-multi-login-action
+        env:
+          secrets: ${{ toJSON(secrets) }}
+      - name: Build and Push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          file: ./Dockerfile
+          platforms: ${{ env.PLATFORMS }}
+          pull: true
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.gen-tags.outputs.fully-qualified-target-images }}
+          build-args: |
+            VERSION=${{ steps.prep.outputs.version }}
+            BUILD_DATE=${{ steps.prep.outputs.build_date }}
+            VCS_REF=${{ steps.prep.outputs.vcs_ref }}
+      - name: Inspect
+        if: ${{ github.event_name != 'pull_request' }}
+        run: |
+          IFS=',' read -r -a images <<< "${{ steps.gen-tags.outputs.fully-qualified-target-images }}"
+          for image in "${images[@]}"; do
+              docker buildx imagetools inspect ${image}
+          done