Add GH action

.github/workflows/docker-image.yml

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+name: Push image
+on:
+  schedule:
+    # Rebuild once a week
+    - cron:  '0 0 * * 0'
+  push:
+    branches: [ main ]
+
+  # Allow running this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout image repo
+        uses: actions/checkout@v3
+      - name: Checkout upstream repo
+        uses: actions/checkout@v3
+        with:
+          repository: mailhog/mailhog
+          token: ${{ secrets.GITHUB_TOKEN }}
+          path: upstream
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Create tags
+        id: create-tag
+        run: |
+          # Find latest tag
+          cd upstream
+          VERSION="$(git describe --tags $(git rev-list --tags --max-count=1))"
+          VERSION_DATE="$VERSION-$(date +'%Y-%m-%d')"
+          
+          GHCR_IMAGE=ghcr.io/${{ github.repository_owner }}/mailhog
+          TAGS="${GHCR_IMAGE}:latest,${GHCR_IMAGE}:${VERSION},${GHCR_IMAGE}:${VERSION_DATE}"
+          echo "TAGS=${TAGS}" | tee -a $GITHUB_ENV
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ env.TAGS }}
+          labels: |
+            org.opencontainers.image.authors=${{ github.repository_owner }}
+            org.opencontainers.image.created=${{ env.BUILD_DATE }}
+            org.opencontainers.image.description=Created from commit ${{ env.GIT_SHA }} and ref ${{ env.GIT_REF }}
+            org.opencontainers.image.ref.name=${{ env.GIT_REF }}
+            org.opencontainers.image.revision=${{ env.GIT_SHA }}
+            org.opencontainers.image.source=https://github.com/${{ github.repository }}
+            org.opencontainers.image.description=Created from commit ${{ env.GIT_SHA}} and ref ${{ env.GIT_REF }}
+      

.gitignore

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+.idea

LICENSE

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+MIT License
+
+Copyright (c) 2023 Cloudogu
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+MailHog [![Docker Build and Push](https://github.com/cloudogu/mailhog-image/actions/workflows/docker-image.yml/badge.svg)](https://github.com/cloudogu/mailhog/actions/workflows/docker-image.yml)
+=========
+
+| :information_source: | This is a fork from upstream [mailhog](https://github.com/mailhog/MailHog) that provides more recent image builds    |
+|---------------|:------------------------|
+
+See [mailhog's README](https://github.com/mailhog/MailHog/blob/master/README.md) for more details.
+
+## Running
+
+```bash
+docker run --rm -d -p 1025:1025 -p 8025:8025 ghcr.io/cloudogu/mailhog
+```
+You can send mails via SMTP to localhost:1025 and see mailhogs web UI via localhost:8025
+
+## Releasing
+
+To build and push a fresh image on the latest alpine version and mailhog, just [run GH action](https://github.com/cloudogu/mailhog-image/actions/workflows/docker-image.yml). This sets three tags
+* `latest`
+* MailHog's latest tag, e.g. `1.0.1`
+* MailHog's latest tag + time stamp, e.g. `1.0.1-2023-10-25`