Change tag convention and allow multiple registries (#1763)

* Change tag convention and allow multiple registries

* Add ghcr username secret

* Introduce repository secrets

Again, use-case being forks not having to change these values in the YAML.

* Update image tag according to convention

* Add available sources and tag convention

.github/workflows/default_on_push.yml

@@ -2,7 +2,11 @@ name: "Build, Test & Deploy"
 
 on:
   push:
-    branches: [ "master", "stable" ]
+    branches:
+      - master
+      - stable
+    tags:
+      - '*.*.*'
 
 jobs:
   build-and-test-image:
@@ -52,14 +56,16 @@ jobs:
           submodules: recursive
       - name: Prepare tags
         id: prep
-        run: |
-          DOCKER_IMAGE=${{ secrets.DOCKER_REPOSITORY }}
-          VERSION=latest
-          [[ $GITHUB_REF == refs/tags/* ]] && VERSION=${GITHUB_REF#refs/tags/v}
-          [[ $GITHUB_REF == 'refs/heads/stable' ]] && VERSION=stable
-          TAGS="${DOCKER_IMAGE}:${VERSION}"
-          [[ $VERSION =~ ^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$ ]] && TAGS="$TAGS,${DOCKER_IMAGE}:latest"
-          echo ::set-output name=tags::${TAGS}
+        uses: crazy-max/ghaction-docker-meta@v1
+        with:
+          images: |
+            ${{ secrets.DOCKER_REPOSITORY }}
+            ${{ secrets.GHCR_REPOSITORY }}
+          tag-edge: true
+          tag-semver: |
+            {{major}}
+            {{major}}.{{minor}}
+            {{major}}.{{minor}}.{{patch}}
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v1
       - name: Set up Docker Buildx
@@ -77,6 +83,12 @@ jobs:
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ secrets.GHCR_USERNAME }}
+          password: ${{ secrets.GHCR_PASSWORD }}
       - name: Build image locally
         uses: docker/build-push-action@v2
         with:

CONTRIBUTING.md

@@ -34,7 +34,7 @@ The development workflow is the following:
 7. [Commit][commit] and [sign your commit][gpg], push and create a pull-request to merge into `master`
    1. Pull requests are automatically tested against the CI and will be reviewed when tests pass
    2. When your changes are validated, your branch is merged
-   3. CI builds the new `:latest` image
+   3. CI builds the new `:edge` image immediately and your changes will be includes in the next version release.
 
 ## Coding Style
 

README.md

@@ -61,6 +61,21 @@ A fullstack but simple mail server (SMTP, IMAP, LDAP, Antispam, Antivirus, etc.)
 
 ## Usage
 
+### Available image sources / tags
+
+The [CI/CD workflows](https://github.com/docker-mailserver/docker-mailserver/actions) automatically build, test and push new images to container registries. Currently, the following registries are supported:
+- [DockerHub](https://hub.docker.com/repository/docker/mailserver/docker-mailserver)
+- [GitHub Container Registry](https://github.com/orgs/docker-mailserver/packages?repo_name=docker-mailserver)
+
+All workflows are using the **tagging convention** listed below. It is subsequently applied to all images pushed to supported container registries:
+
+| Event        | Ref                   | Commit SHA | Image Tags                    |
+|--------------|-----------------------|------------|-------------------------------|
+| `push`       | `refs/heads/master`   | `cf20257`  | `edge`                        |
+| `push`       | `refs/heads/stable`   | `cf20257`  | `stable`                      |
+| `push tag`   | `refs/tags/1.2.3`     | `ad132f5`  | `1.2.3`, `1.2`, `1`, `latest` |
+| `push tag`   | `refs/tags/v1.2.3`    | `ad132f5`  | `1.2.3`, `1.2`, `1`, `latest` |
+
 ### Get the tools
 
 Download the `docker-compose.yml`, `compose.env`, `mailserver.env` and the `setup.sh` files: