Merge #3737

3737: Fix `clamav` path to allow for updates (backport #3735) r=mergify[bot] a=mergify[bot]

## What type of PR?

Bug-fix, documentation

## What does this PR do?

### Related issue(s)
Closes https://github.com/Mailu/Mailu/issues/3673 by placing ClamAV files under `mailu/clamav` instead of `mailu/filter/clamav`.

Users will want to change their `docker-compose.yml` accordingly and remove `mailu/filter/clamav` after upgrade.

I also updated ClamAV version while I was at it (I didn't find any breaking changes in the changelog), though [the latest release is not pushed to this image yet](https://github.com/Cisco-Talos/clamav/issues/1442). Also I'm wondering why is it using exact version instead of `:1` or `:1.4` for example, but decided to not change that to make it less controversial.

## Prerequisites
This will not affect existing setups, though it would be nice to notify users somehow.

<hr>This is an automatic backport of pull request #3735 done by [Mergify](https://mergify.com).

Co-authored-by: Nazar Mokrynskyi <nazar@mokrynskyi.com>

setup/flavors/compose/docker-compose.yml

@@ -217,7 +217,7 @@ services:
   # Optional services
   {% if antivirus_enabled %}
   antivirus:
-    image: clamav/clamav-debian:1.2.3-45
+    image: clamav/clamav-debian:1.4
     restart: always
     logging:
       driver: journald
@@ -226,7 +226,7 @@ services:
     networks:
       - clamav
     volumes:
-      - "{{ root }}/filter/clamav:/var/lib/clamav"
+      - "{{ root }}/clamav:/var/lib/clamav"
     healthcheck:
       test: ["CMD-SHELL", "kill -0 `cat /tmp/clamd.pid` && kill -0 `cat /tmp/freshclam.pid`"]
       interval: 10s

tests/compose/filters/docker-compose.yml

@@ -99,7 +99,7 @@ services:
     networks:
       - clamav
     volumes:
-      - "/mailu/filter/clamav:/var/lib/clamav"
+      - "/mailu/clamav:/var/lib/clamav"
     healthcheck:
       test: ["CMD-SHELL", "kill -0 `cat /tmp/clamd.pid` && kill -0 `cat /tmp/freshclam.pid`"]
       interval: 10s

towncrier/newsfragments/3735.bugfix

@@ -0,0 +1,7 @@
+Place ClamAV files under `mailu/clamav` instead of `mailu/filter/clamav` such that they can be modified by ClamAV
+itself.
+
+Users will want to change their `docker-compose.yml` accordingly and remove `mailu/filter/clamav` after upgrade.
+
+Also ClamAV image tag increased to `1.4` instead of specific (older) release, users will need to update it manually as
+well and keep it updated over time.