Auto-trigger docker build for kubernetes helm when new release is announced

The latest docker tag is the latest release version (https://github.com/helm/helm/releases/latest)

Please avoid to use latest tag for any production deployment. Tag with right version is the proper way, such as alpine/helm:3.1.1

If you need run kubectl with helm together, please use another image alpine/k8s

This feature was added on 23th May 2021.

1. Version 3.5.4 and 3.6.0-rc.1 are manually pushed by me with multi-arch image supported
2. Older version will be not updated as multi-arch images
3. Newer vesions from now on will be multi-arch images (--platform linux/amd64,linux/arm/v7,linux/arm64/v8,linux/arm/v6,linux/ppc64le,linux/s390x)
4. tag latest doesn't suppoort multi-arch yet, because I can't find a good way to tag it only without rebuild it.
5. I don't support other architectures, except amd64, because I have no other environment to do that. If you have any issues with other arch, you need raise PR to fix it.
6. There would be no difference for docker pull , docker run command with other arch, you can run it as normal. For example, if you need pull image from arm (such as new Mac M1 chip), you can run docker pull alpine/helm:3.5.4 to get the image directly. Remember, it doesn't support latest tag with multi-arch image yet.

https://github.com/alpine-docker/helm

https://travis-ci.com/alpine-docker/helm

https://hub.docker.com/r/alpine/helm/tags/

# mount local folders in container.
docker run -ti --rm -v $(pwd):/apps -w /apps \
    -v ~/.kube:/root/.kube -v ~/.helm:/root/.helm -v ~/.config/helm:/root/.config/helm \
    -v ~/.cache/helm:/root/.cache/helm \
    alpine/helm

# Run helm with special version. The tag is helm's version
docker run -ti --rm -v $(pwd):/apps -w /apps \
    -v ~/.kube:/root/.kube -v ~/.helm:/root/.helm -v ~/.config/helm:/root/.config/helm \
    -v ~/.cache/helm:/root/.cache/helm \
    alpine/helm:3.1.1

# run container as command
alias helm="docker run -ti --rm -v $(pwd):/apps -w /apps \
    -v ~/.kube:/root/.kube -v ~/.helm:/root/.helm -v ~/.config/helm:/root/.config/helm \
    -v ~/.cache/helm:/root/.cache/helm \
    alpine/helm"
helm --help

# example in ~/.bash_profile
alias helm='docker run -e KUBECONFIG="/root/.kube/config:/root/.kube/some-other-context.yaml" -ti --rm -v $(pwd):/apps -w /apps \
    -v ~/.kube:/root/.kube -v ~/.helm:/root/.helm -v ~/.config/helm:/root/.config/helm \
    -v ~/.cache/helm:/root/.cache/helm \
    alpine/helm'

Mostly it is used during CI/CD (continuous integration and continuous delivery) or as part of an automated build/deployment

• Enable Travis CI cronjob on this repo to run build daily on master branch
• Check if there are new tags/releases announced via Github REST API
• Match the exist docker image tags via Hub.docker.io REST API
• If not matched, build the image with release version and push to https://hub.docker.com/
• Get the latest version from https://github.com/helm/helm/releases/latest, pull the image with that version, tag as alpine/helm:latest and push to hub.docker.com