build: deterministic package order

The order of packages handed over to the ImageBuilder isn't stable when
using `diff_packages`, sort the packages afterwards to be deterministic.

This recently introduced a reproducibility issues where packages are in
different order, resulting packages to be sometimes installed as
dependencies (Auto-Install in OPKG) and sometimes not.

Signed-off-by: Paul Spooren <[email protected]>

api: Fixup double default of CACHE_PATH

This was previously only fixed for the legacy API, fix it for v1, too.

Signed-off-by: Paul Spooren <[email protected]>

api: fix double defaulting of cache_path

Set `cache_path` only if it's actually defined, setting it to `None`
will result the next default to take `None` as the actual value, instead
of defaulting to `Path.pwd()`.

Signed-off-by: Paul Spooren <[email protected]>

stats: add extra package installs

Store how may non default packages were installed. While at it run code
linter and clean some dead code.

Signed-off-by: Paul Spooren <[email protected]>

api: provide /metrics for prometheus export

Instead of inventing a new stats API, use a Prometheus compatible
backend. This commits removes all /api/v1/stats calls and instead
provides everything interesting over at /metrics.

A single metric `builds` is provided with a bunch of tags. Those tags
can be used to create graphs describing which branch/version/profile etc
was build.

While at it, switch testing to use a sync build queue, meaning jobs will
actually run and don't just end up in a "202 ACCEPTED" state.

No longer validate outgoing messages except during testing to speed up
the server.

Signed-off-by: Paul Spooren <[email protected]>

CI: Store Python version as String

Else YAML will read Python 3.10 as Python 3.1.

Signed-off-by: Paul Spooren <[email protected]>

CI: use latest Docker build-and-push action

* This makes tagging much more complex but why not.
* Format the CI file to be more consistent with other actions.
* Run pipeline on tags starting with `v` as well.

Signed-off-by: Paul Spooren <[email protected]>

docker: simplify docker-compose

And also make it compatible with podman-compose.
Host it by default on port 8080 which can run without root privs.
Add missing copy of config.py to README.
Add missing env variable for Redis host.

Signed-off-by: Paul Spooren <[email protected]>

api: prefer profile directly over mapped one

Within OpenWrt the profile does not always matches the `board_name`,
which is determined via device tree files. As a workaround ASU
automatically parsed the "supported" devices and mapped incomming
requests to profiles. In some rare cases (openwrt#319) the support profile is
actually a different profile than the one installed, in this case a
device that support images with and without nand storage.

To fix this, first check if a profile with the device tree model exists
(by replacing `,` with `_`) and only use the *supported mapping* if it
does not.

Fixes: openwrt#319

Signed-off-by: Paul Spooren <[email protected]>

black: apply style to tests

Signed-off-by: Paul Spooren <[email protected]>