Building the container currently does not work properly.
When rebuilding several times with `make container`, `version_frozen.py`
is recreated, which wouldn't be an issue if the file’s timestamp was constant.
Now, when creating `version_frozen.py`, it will have the same timestamp as the
commit when it was created. (`version_frozen.py` is moved to a dedicated layer).
Reusing "builder" cache when building "dist" could be slow
(CD reports 2 seconds, but locally I've seen it take up to 10 seconds),
so the Dockerfile is now split and we save a couple steps
by importing the "builder" image directly.
The last changes made it possible to remove the layer cache in "builder",
since the overhead is now greater than building the layers from scratch.
Until now, all "dist" layers were squashed into a single layer,
which in most cases is a good idea
(except for storage/delivery pricing/overhead), but in our case,
since we manage the entire pipeline, we can ignore this
and share layers between builds.
This means (for example) that if we change files unrelated to the container
in several consecutive commits (documentation changes), we don't have to push
the entire image to registry, but only the different layers
(`version_frozen.py` in this example).
The same applies when pulling, as only the layers that have changed
compared to the local layers will be downloaded (that's the theory,
we'll see if this works as expected or if we need to tweak something else).
Temporarily remove the -e flag from set to prevent entrypoint.sh from stopping execution if any command returns a non-zero status. This doesn't solve anything but relaxes the script checks.
Related https://github.com/searxng/searxng/issues/4818
That entrypoint is prone to screw things up, especially with permission handling. The new script handles initialization better and fixes some issues like delayed settings update via ENVs and timestamp overwriting, also adjusts what should be copied into the container.
Related https://github.com/searxng/searxng/pull/4721#issuecomment-2850272129
