releasing package debootstrap version 1.0.125

functions: define link_dir before using it

See merge request installer-team/debootstrap!48

Fix detection of docker container for cgroup v2 (Closes: #985481).

See merge request installer-team/debootstrap!52

Fix auto proxy discovery (Closes: #985811)

See merge request installer-team/debootstrap!53

* functions (download_main): Let the loops try the different components and
    suites when the checksum doesn't match. This is needed when several of
    them contain the same package name.

LP: #1923845

Ubuntu impish sync

See merge request installer-team/debootstrap!56

dpkg-deb support is proposed in Debian, available in Ubuntu for 3+
years now.

Signed-off-by: Dimitri John Ledkov <xnox@ubuntu.com>

This was introduced in ed6f85629d. This
was a commit from 2013, merged in 2018, according to the git logs.

However it seems that the option name has changed since then.
apt-transport-http(1) says:

    Acquire::http::Proxy-Auto-Detect can be used to specify an external
    command to discover the HTTP proxy to use.
    [...]
    This option takes precedence over the legacy option name
    Acquire::http::ProxyAutoDetect.

In docker, the TARGET/proc will be a symlink to /proc.
And if the docker instance is called with --privileged, it will umount
the /proc of the whole instance in setup_proc.

suggested by jhcha54008

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Merge tag '1.0.123' into suites/unstable

tagging version 1.0.123