Image should include 'sshpass' package by default

[MalikKillian]

Although it's probably ill-advised, connecting to a remote node with password authentication is still a valid use-case for Ansible. However, after much experimenting it seems clear that docker-ansible does not support password authentication out of the box.

These should be the minimum steps to reproduce:

1. Create a new inventory file containing a single host that allows SSH password authentication.

[server01]
# Docker container running SSHD, root login is allowed
127.0.0.1 ansible_port=49153 ansible_ssh_user=root

2. Run a simple ping test using ansible:latest-tools (should apply to any version really).

$ docker run --rm -it \
  -e USER=ansible \
  -v $(pwd):/data \
  cytopia/ansible:latest-tools ansible all --ask-pass -i temp-inventory -m ping

3. Enter the remote user's password when prompted.

[INFO] Running container with user 'ansible'
[INFO] Adjusting local user with uid:1000 and gid:1000
[INFO] Adjusting ownership on directory: ~/.gnupg/
[INFO] Adjusting ownership on directory: ~/.ssh/
[INFO] ansible> ansible all --ask-pass -i temp-inventory -m ping
SSH password: 

The result will be a failure with this message:

127.0.0.1 | FAILED! => {
    "msg": "to use the 'ssh' connection type with passwords or pkcs11_provider, you must install the sshpass program"
}

Running the following commands demonstrates that adding the sshpass package should be all that is needed to provide password authentication:

$ docker run --rm -it \
  -v (pwd):/data \
  --net=host \
  cytopia/ansible:latest-tools sh
[INFO] root> sh
/data # apk add sshpass
fetch https://dl-cdn.alpinelinux.org/alpine/v3.13/main/x86_64/APKINDEX.tar.gz
fetch https://dl-cdn.alpinelinux.org/alpine/v3.13/community/x86_64/APKINDEX.tar.gz
(1/1) Installing sshpass (1.06-r0)
Executing busybox-1.32.1-r7.trigger
OK: 111 MiB in 86 packages
/data # ANSIBLE_HOST_KEY_CHECKING=False ansible all --ask-pass -i temp-inventory -m ping
SSH password: 
[WARNING]: Platform linux on host 127.0.0.1 is using the discovered Python interpreter at /usr/bin/python3.9, but future installation of another Python interpreter could
change the meaning of that path. See https://docs.ansible.com/ansible-core/2.12/reference_appendices/interpreter_discovery.html for more information.
127.0.0.1 | SUCCESS => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/bin/python3.9"
    },
    "changed": false,
    "ping": "pong"
}