create docker releases

.github/workflows/docker-image-release.yml

@@ -0,0 +1,77 @@
+name: build and push docker image (release)
+on:
+  push:
+    # run only against tags
+    tags:
+      - "*"
+
+jobs:
+  build-docker-release:
+    strategy:
+      matrix:
+        arch: [x86_64]
+
+    runs-on: ubuntu-latest
+    steps:
+      - name: setup-docker
+        uses: docker-practice/actions-setup-docker@master
+
+      - name: Install nix
+        uses: cachix/install-nix-action@v12
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+          install_url: https://github.com/numtide/nix-unstable-installer/releases/download/nix-2.12.0pre20221005_ac0fb38/install
+          # Configure Nix to enable flakes
+          extra_nix_config: |
+            experimental-features = nix-command flakes
+
+      - name: login to docker hub
+        run: echo "${{ secrets.DOCKER_PASSWORD }}" | docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
+
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          # Nix Flakes doesn't work on shallow clones
+          fetch-depth: 0
+
+      - name: build docker image
+        run: |
+          nix build .#packages.${{ matrix.arch }}-linux.docker-image
+          docker load < result
+
+      - name: execute docker image
+        run: |
+          docker run --rm mayniki/shelly-exporter:latest shelly-exporter -h
+
+      - name: Set output
+        id: vars
+        run: echo ::set-output name=tag::${GITHUB_REF#refs/*/}
+
+      - name: push docker image
+        run: |
+          docker tag mayniki/shelly-exporter:latest mayniki/shelly-exporter:${{ matrix.arch }}-${{ steps.vars.outputs.tag }}
+          docker push mayniki/shelly-exporter:${{ matrix.arch }}-${{ steps.vars.outputs.tag }}
+
+  manifest-create:
+    needs: [build-docker-release]
+    runs-on: ubuntu-latest
+    steps:
+      - name: setup-docker
+        uses: docker-practice/actions-setup-docker@master
+
+      - name: login to docker hub
+        run: echo "${{ secrets.DOCKER_PASSWORD }}" | docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
+
+      - name: Set output
+        id: vars
+        run: echo ::set-output name=tag::${GITHUB_REF#refs/*/}
+
+      - name: create manifest
+        run: |
+          docker manifest create \
+          mayniki/shelly-exporter:${{ steps.vars.outputs.tag }} \
+          --amend mayniki/shelly-exporter:x86_64-${{ steps.vars.outputs.tag }}
+
+      - name: push manifest
+        run: |
+          docker manifest push mayniki/shelly-exporter:${{ steps.vars.outputs.tag }}