Add release workflow

.github/workflows/release.yaml

@@ -0,0 +1,48 @@
+on:
+  push:
+    tags:
+      - 'v*'
+
+name: Release
+
+jobs:
+  release:
+    runs-on: ubuntu-20.04
+
+    env:
+      DOCKER_REPO: ghcr.io/devplayer0/docker-net-dhcp
+      PLATFORMS: linux/amd64,linux/386,linux/arm64,linux/arm/v7
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Install script dependencies
+        run: pip3 install -r scripts/requirements.txt
+
+      - id: vars
+        name: Generate release vars
+        run: |
+          echo "::set-output name=version::"$(echo "${{ github.ref }}" | sed -r 's|refs/tags/v(.+)|\1|')""
+          echo "Changelog: " > release.md
+          git log --pretty=format:" - %s" "$(git describe --tags --abbrev=0 ${{ github.event.ref }}^)"..${{ github.event.ref }} >> release.md
+
+      - name: Tag with release
+        env:
+          REGISTRY_USERNAME: ${{ github.actor }}
+          REGISTRY_PASSWORD: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          scripts/tag_multiarch_plugin.py -p $PLATFORMS "$DOCKER_REPO:latest" ${{ steps.vars.outputs.version }}
+          scripts/tag_multiarch_plugin.py -p $PLATFORMS "$DOCKER_REPO:latest" release
+
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: '${{ secrets.GITHUB_TOKEN }}'
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: docker-net-dhcp ${{ steps.vars.outputs.version }}
+          body_path: release.md