add multiarch docker (test-)build and publish on codeberg

Docker/buildx.yml

@@ -0,0 +1,41 @@
+# Build and publish Docker images for multible architectures.
+# 
+# Pushing an image to codeberg as container registry,
+# package owner will be the repo owner.
+#
+# this config also shows usage of yaml aliases and
+# was taken from https://codeberg.org/6543/docker-images/src/commit/37e29c227717c1c07d2776cddcf14725bf952875/.woodpecker/hello.yml
+
+branches: main
+
+variables:
+  - &file Dockerfile.hello
+  - &repo codeberg.org/${CI_REPO_OWNER}/hello
+
+pipeline:
+  dryrun:
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      dockerfile: *file
+      platforms: linux/arm/v7,linux/arm64/v8,linux/amd64,linux/ppc64le
+      dry_run: true
+      repo: *repo
+      tags: latest
+    when:
+      event: pull_request
+      path: *file
+
+  publish:
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      dockerfile: *file
+      platforms: linux/arm/v7,linux/arm64/v8,linux/amd64,linux/ppc64le
+      repo: *repo
+      registry: codeberg.org
+      tags: latest
+      username: ${CI_REPO_OWNER}
+      password:
+        from_secret: cb_token
+    when:
+      event: push
+      path: *file

README.md

@@ -12,9 +12,11 @@ Pull requests are accepted/welcome.
 | [golang/build-docker.yml](golang/build-docker.yml) | golang | golang / kaniko | CI to build golang project and build various docker container and publish them on DockerHub |
 | [Jekyll/jekyll.yml](Jekyll/jekyll.yml) | Markdown | Jekyll | CI step to build static website files and publish them to Codeberg Pages using Jekyll |
 | [Hugo/hugo.yml](Hugo/hugo.yml) | Markdown | Hugo | CI step to build static website files and publish them to Codeberg Pages with Hugo |
-| [Docker/docker.yml](Docker/kaniko.yml) | Dockerfile | [Kaniko][1] | Minimalistic CI pipeline with clear instructions to push a Docker image |
+| [Docker/kaniko.yml](Docker/kaniko.yml) | Dockerfile | [Kaniko][1] | Minimalistic CI pipeline with clear instructions to push a Docker image |
+| [Docker/buildx.yml](Docker/buildx.yml) | Dockerfile | [buildx][2] | Build and publish Docker images for multible architectures on codeberg |
 
 # More:
 https://codeberg.org/explore/repos?q=woodpecker-ci&topic=1
 
 [1]: https://github.com/GoogleContainerTools/kaniko
+[2]: https://codeberg.org/woodpecker-plugins/plugin-docker-buildx