when master changes push images to docker hub

Author: Gianluca Arbezzano

docs/contribution/release.md

@@ -1,200 +1,4 @@
 # how release works
 
-Prerequisite:
-
-* docker installed
-* How drone works
-* How [goreleaser](https://goreleaser.com/intro/) works and you have to
-  [install](https://goreleaser.com/install/) it to try a release locally.
-* multi arch TODO, don't know yet
-
-## Continuous Delivery
-
-We use GitHub Action as continuous integration and continuous delivery pipeline.
-Integration means: running tests, checking code quality.
-Delivery means: make a release when a new tag get pushed.
-
-GoReleaser is used only when a new tag gets pushed. We also push a new image
-every time master changes. I will document this workflow in its own chapter:
-"push from master" at the end of this document but at the moment it does not use
-GoReleaser.
-
-## goreleaser
-
-GoReleaser is a popular tool to release Go applications and library.
-
-We use GoReleaser for the following features:
-
-* Multi arch build. It uses Go cross compilation feature to build for Darwin and
-  Linux (arm and amd)
-* Docker to build docker images for Linux container arm and amd.
-* Changelog to generate a changelog that will be pushed in the GitHub release
-  page with the list of PR part of the release itself.
-* Artifact (binaries) will be pushed as part of GitHub release page as well as
-  the other YAML file required by cluster-api like: metadata.yaml,
-  infrastructure-provider.yaml and so on.
-
-First things you should check if the file `./goreleaser.yaml` in the project
-root because it gives you an idea about what it does.
-
-## Directories and general workflow
-
-The release life cycle touches two directories:
-
-1. `./dist` it is a temporary directory used by GoReleaser to bundle all the
-   required files and, binaries, changelog and so on. It is in gitignore.
-2. `./out` is ignored by git and it gets generated via `make release`. It is a
-   bundle that contains generated Kubernetes manifest required by the
-   cluster-api such as: metadata.yaml, infrastructure-provider.yaml,
-   cluster-template.yaml and so on.
-
-GoReleaser works in this way:
-
-1. it builds binaries in `./dist`
-2. moves all the file that has to be added in the release archive and release
-   page such as: LICENSE, README, the kubernetes manifests in `./dist`
-3. Build docker images
-4. Push all the archives and the images to GitHub and to Docker Hub.
-
-## Local workflow
-
-GoReleaser can be used locally, to visualize how a release will look like for
-example:
-
-```
-$ goreleaser release --rm-dir --skip-publish
-```
-
-You can run this command if your git HEAD has a tag. You can make a temporary
-one:
-
-```
-git tag v0.10.0
-```
-
-Or you can decided to run GoRelease in `--snapshot` mode to avoid a fake tag
-(but changelog won't work):
-
-```
-$ goreleaser release --rm-dir --snapshot --skip-publish
-```
-
-*Removing --skip-publish goreleaser will attempt a push to GitHub and to your
-docker image repository (docker.io). In this way you can cut a release from your
-laptop if needed. But it is not a good idea and we use drone for that. Normally
-at Packet only drone.io is capable of pushing to Docker Hub and GitHub.*
-
-We have an utility target that helps you do try a release:
-
-```
-make release
-```
-
-If you know what you are doing and you have the right access to GitHub and
-Docker Hub you can use:
-
-```
-make release/publish
-```
-**THIS IS NOT USUALLY REQUIRED AND YOU SHOULD NOT DO IT!**
-
-## Drone workflow
-
-Drone is capable of triggering a command only when a new tag is pushed.
-The command it runs is: `goreleaser release`.
-
-In order to push artifacts and a release page, drone needs to have access to
-docker image repository and GitHub via access token.
-
-## push from master
-
-We push images to Docker Hub tagged as the git commit sha and latest every time
-master changes (usually when a PR gets merged).
-
-This process at the moment does not use GoReleaser (it will may use it in the
-future) and you can check how it works look at the `./.github/workflows/ci.yaml`
-file. In practice when master changes an action will build and push the new
-images to Docker Hub.
-
-## example of goreleaser output
-
-This is an example of a valid goreleaser output that I ran locally via `make release`
-
-```
-goreleaser release --rm-dist --snapshot --skip-publish
-
-   • releasing...
-   • loading config file       file=.goreleaser.yml
-   • running before hooks
-   • loading environment variables
-   • getting and validating git state
-      • releasing v0.1.0, commit 1f8e0e31d10a3f4f909fbcd9249fb12b14bf0010
-      • pipe skipped              error=disabled during snapshot mode
-   • parsing tag
-   • setting defaults
-      • snapshotting
-      • github/gitlab/gitea releases
-      • project name
-      • building binaries
-      • creating source archive
-      • archives
-      • linux packages
-      • snapcraft packages
-      • calculating checksums
-      • signing artifacts
-      • docker images
-      • artifactory
-      • blobs
-      • homebrew tap formula
-      • scoop manifests
-   • snapshotting
-   • checking ./dist
-      • --rm-dist is set, cleaning it up
-   • writing effective config file
-      • writing                   config=dist/config.yaml
-   • generating changelog
-      • pipe skipped              error=not available for snapshots
-   • building binaries
-      • building                  binary=/Users/gianarb/git/cluster-api-provider-packet/dist/capp_l
-inux_arm64/manager
-      • building                  binary=/Users/gianarb/git/cluster-api-provider-packet/dist/capp_d
-arwin_amd64/manager
-      • building                  binary=/Users/gianarb/git/cluster-api-provider-packet/dist/capp_l
-inux_amd64/manager
-   • archives
-      • creating                  archive=dist/cluster-api-provider-packet_v0.1.0-next_Linux_x86_64
-.tar.gz
-      • creating                  archive=dist/cluster-api-provider-packet_v0.1.0-next_Linux_arm64.
-tar.gz
-      • creating                  archive=dist/cluster-api-provider-packet_v0.1.0-next_Darwin_x86_6
-4.tar.gz
-   • creating source archive
-      • pipe skipped              error=source pipe is disabled
-   • linux packages
-   • snapcraft packages
-   • calculating checksums
-      • checksumming              file=cluster-api-provider-packet_v0.1.0-next_Darwin_x86_64.tar.gz
-      • checksumming              file=cluster-api-provider-packet_v0.1.0-next_Linux_arm64.tar.gz
-      • checksumming              file=cluster-api-provider-packet_v0.1.0-next_Linux_x86_64.tar.gz
-   • signing artifacts
-   • docker images
-      • building docker image     image=packethost/cluster-api-provider-packet:latest-amd64
-      • building docker image     image=packethost/cluster-api-provider-packet:latest-arm64
-      • pipe skipped              error=docker.skip_push is set
-   • publishing
-      • blobs
-         • pipe skipped              error=blobs section is not configured
-      • http upload
-         • pipe skipped              error=uploads section is not configured
-      • docker images
-         • pipe skipped              error=publishing is disabled
-      • snapcraft packages
-         • pipe skipped              error=publishing is disabled
-      • github/gitlab/gitea releases
-         • pipe skipped              error=publishing is disabled
-      • homebrew tap formula
-         • token type                type=
-      • scoop manifests
-         • pipe skipped              error=publishing is disabled
-   • release succeeded after 8.29s
-```
+Currently when master changes CI builds Docker images and pushes them to Docker
+Hub.