Support SSH authentication for git artifacts

[alexmt]

Is this a BUG REPORT or FEATURE REQUEST?:

FEATURE REQUEST

What happened:

HTTPS and password authentication might be disabled. Argo should support authentication using ssh key.

What you expected to happen:

It should be possible to define git artifact using 'git@' url and ssh key secret:

        git:
          repo: "git@github.com:argoproj/argo.git"
          revision: "master"
          sshKeySecret: 'argo-github-ssh'

[kindermoumoute]

This workaround worked for me:

apiVersion: argoproj.io/v1alpha1
kind: Workflow
metadata:
  generateName: git-clone-template
spec:
  entrypoint: clone-and-do-stuff
  arguments:
    parameters:
    - name: revision
      value: master
  volumes:
    - name: ssh-key
      secret:
        defaultMode: 0400
        secretName: github-creds
  volumeClaimTemplates:
  - metadata:
      name: workdir
    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 1Gi
  templates:
  - name: clone-and-do-stuff
    steps:
    - - name: provision
        template: git-clone
    - - name: stuff
        template: do-stuff


  - name: git-clone
    container:
      image: alpine/git
      workingDir: /src
      command: [sh, -c]
      args: [ "git clone -b {{workflow.parameters.revision}} --single-branch git@github.com:org/repo.git" ]
      volumeMounts:
      - name: ssh-key
        mountPath: "/root/.ssh"
      - name: workdir
        mountPath: /src

  - name: do-stuff
    container:
      image: other/container
      workingDir: /src/repo
      volumeMounts:
      - name: workdir
        mountPath: /src

github-creds secret:

kubectl create secret generic github-creds --from-file=~/.ssh/id_rsa --from-file=~/.ssh/known_hosts

[andreimc]

#919 this does all 3 basic auth private key and plain using go-git

[andreimc]

@alexmt can you check it out and merge if all good?

[andreimc]

@jessesuen this can be closed with #919 merge

[jessesuen]

Thanks @andreimc.

Fixed in PR #919, commit 4744f45