[LXC] fedora33 EOL [1], upgrade to fedora35 [2]

[1] https://docs.fedoraproject.org/en-US/releases/eol/
[2] https://docs.fedoraproject.org/en-US/releases/f35/

Tested by::

    # build the container ..
    $ sudo -H ./utils/lxc.sh build searx-fedora35

    # open a shell in the container
    $ sudo -H ./utils/lxc.sh cmd searx-fedora35 bash
    [root@searx-fedora35 SearXNG]#

    # install a complete SearXNG suite ..
    [root@searx-fedora35 SearXNG]# ./utils/searx.sh install all
    ...

    # install apache to export the SearXNG instance by HTTP
    [root@searx-fedora35 SearXNG]# ./utils/searx.sh apache install
    ...
    INFO:  got 200 from http://10.174.184.94/searx

To build wheel `python3-devel` needs to be added to SEARX_PACKAGES_fedora::

    |searx|   × Building wheel for setproctitle (pyproject.toml) did not run successfully.
    |searx|   │ exit code: 1
    ...
    |searx|       In file included from src/spt.h:15,
    |searx|                        from src/setproctitle.c:14:
    |searx|       src/spt_python.h:16:10: fatal error: Python.h: No such file or directory
    |searx|          16 | #include <Python.h>
    |searx|             |          ^~~~~~~~~~
    |searx|       compilation terminated.
    |searx|       error: command '/usr/bin/gcc' failed with exit code 1
    |searx|       [end of output]
    ...
    |searx|   ERROR: Failed building wheel for setproctitle

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

utils/lxc-searx.env

@@ -26,7 +26,7 @@ lxc_set_suite_env() {
         "$LINUXCONTAINERS_ORG_NAME:ubuntu/20.10"  "ubu2010" # July 2021
 
         # EOL see https://fedoraproject.org/wiki/Releases
-        "$LINUXCONTAINERS_ORG_NAME:fedora/33"     "fedora33"
+        "$LINUXCONTAINERS_ORG_NAME:fedora/35"     "fedora35"
 
         # rolling releases see https://www.archlinux.org/releng/releases/
         "$LINUXCONTAINERS_ORG_NAME:archlinux"     "archlinux"

utils/lxc.sh

@@ -51,7 +51,7 @@ echo 'Set disable_coredump false' >> /etc/sudo.conf
 "
 
 # shellcheck disable=SC2034
-fedora33_boilerplate="
+fedora35_boilerplate="
 dnf update -y
 dnf install -y git curl wget hostname
 echo 'Set disable_coredump false' >> /etc/sudo.conf

utils/searx.sh

@@ -58,9 +58,9 @@ texlive-core texlive-latexextra ttf-dejavu"
 
 # dnf packages
 SEARX_PACKAGES_fedora="\
-python python-pip python-lxml python-babel
+python python-pip python-lxml python-babel python3-devel
 uwsgi uwsgi-plugin-python3
-git @development-tools libxml2
+git @development-tools libxml2 openssl
 ShellCheck"
 
 BUILD_PACKAGES_fedora="\