From 37fa154924d69d1279a904ef3676ef464fc3314a Mon Sep 17 00:00:00 2001
From: Robert Schuh <github@eneticum.de>
Date: Wed, 4 May 2022 09:40:21 +0200
Subject: [PATCH] Create docker-publish.yml

---
 .github/workflows/docker-publish.yml | 49 ++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 .github/workflows/docker-publish.yml

diff --git a/.github/workflows/docker-publish.yml b/.github/workflows/docker-publish.yml
new file mode 100644
index 0000000..9b2202b
--- /dev/null
+++ b/.github/workflows/docker-publish.yml
@@ -0,0 +1,49 @@
+name: Docker
+
+on:
+  push:
+    # Publish `main` as Docker `latest` image.
+    branches:
+      - main
+
+    # Publish `v1.2.3` tags as releases.
+    tags:
+      - v*
+
+env:
+  IMAGE_NAME: default
+
+jobs:
+  push:
+
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push'
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Build image
+        run: docker build . --file Dockerfile --tag $IMAGE_NAME --cache-from ghcr.io/${{ github.repository }}:latest
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Push image
+        run: |
+          IMAGE_ID=ghcr.io/${{ github.repository }}
+          # Change all uppercase to lowercase
+          IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
+          # Strip git ref prefix from version
+          VERSION=$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')
+          # Strip "v" prefix from tag name
+          [[ "${{ github.ref }}" == "refs/tags/"* ]] && VERSION=$(echo $VERSION | sed -e 's/^v//')
+          # Use Docker `latest` tag convention
+          [ "$VERSION" == "main" ] && VERSION=latest
+          echo IMAGE_ID=$IMAGE_ID
+          echo VERSION=$VERSION
+          docker tag $IMAGE_NAME $IMAGE_ID:$VERSION
+          docker push $IMAGE_ID:$VERSION