store: setting retention policy in size for test stage

[apentori]

Change to avoid LowDiskSpace Issue

[yakimant]

Will it be difficult to have % of actual volume size on host?

Would be great to have the same for infra-waku!

[jakubgs]

Anton is right, we can get actual volume size from ansible_mounts, you can access it by mount point or device path and then use size_available. Here's some example data:

ok: [store-01.gc-us-central1-a.shards.staging] => {
    "ansible_mounts": [
        {
            "block_available": 1309037,
            "block_size": 4096,
            "block_total": 3763585,
            "block_used": 2454548,
            "device": "/dev/root",
            "fstype": "ext4",
            "inode_available": 1788632,
            "inode_total": 1935360,
            "inode_used": 146728,
            "mount": "/",
            "options": "rw,relatime,discard,errors=remount-ro",
            "size_available": 5361815552,
            "size_total": 15415644160,
            "uuid": "f1be01a0-d90a-4f70-b85c-02f77635760d"
        },
        {
            "block_available": 201292,
            "block_size": 512,
            "block_total": 213663,
            "block_used": 12371,
            "device": "/dev/sda15",
            "fstype": "vfat",
            "inode_available": 0,
            "inode_total": 0,
            "inode_used": 0,
            "mount": "/boot/efi",
            "options": "rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro",
            "size_available": 103061504,
            "size_total": 109395456,
            "uuid": "8EA5-EDF8"
        }
    ]
}

You can see an example of how I access it here:
https://github.com/status-im/infra-ci/blob/d3d69e520f147da2807741e1b25afe7bf6d59dda/ansible/cleanup.yml#L5