manual workflow for debugging

Signed-off-by: Jürgen Eckel <juergen@riddleandcode.com>

.github/workflows/publish-docker.yml

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+# Copyright © 2020 Interplanetary Database Association e.V.,
+# Planetmint and IPDB software contributors.
+# SPDX-License-Identifier: (Apache-2.0 AND CC-BY-4.0)
+# Code is Apache-2.0 and docs are CC-BY-4.0
+
+---
+name: CI
+on:
+  workflow_dispatch:
+    branches:
+      - "*"
+
+permissions: 
+  packages: write
+
+  publish-docker:
+    runs-on: ubuntu-latest
+    steps:
+      # Get the repository's code
+      - name: Checkout
+        uses: actions/checkout@v2
+      # https://github.com/docker/setup-qemu-action
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      # https://github.com/docker/setup-buildx-action
+      - name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+      - name: Login to GHCR
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Docker meta
+        id: semver # you'll use this in the next step
+        uses: docker/metadata-action@v3
+        with:
+          # list of Docker images to use as base name for tags
+          images: |
+            ghcr.io/planetmint/planetmint
+          # Docker tags based on the following events/attributes
+          tags: |
+            type=schedule
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha
+      - name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm/v7,linux/arm/v8
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.<meta_id>.outputs.tags }}
+          labels: ${{ steps.<meta_id>.outputs.labels }}