MDEV-39015 - Revert Deb/Ubu debian/control base back to 10.11

MariaDB/server#4863 targeting 11.4, is removing
the boost deps to support CS 6.4 so we can't base older Ubu/Deb
on 11.4, because server versions 10.6/10.11 (CS 6.4) are still built there.

Older Ubu/Deb build 11.4 + so ARM deps are still a requirement,
resulting in a small hack to the downloaded debian/control file.

Author: RazvanLiviuVarzaru

.github/workflows/build-debian-based.yml

@@ -38,18 +38,18 @@ jobs:
         include:
           - image: debian:11
             platforms: linux/amd64, linux/arm64/v8
-            branch: 11.4
+            branch: 10.11
             nogalera: false
 
           - image: debian:12
             platforms: linux/amd64, linux/arm64/v8, linux/ppc64le
-            branch: 11.4
+            branch: 10.11
             tag: debian12
             nogalera: false
 
           - image: debian:12
             platforms: linux/386
-            branch: 11.4
+            branch: 10.11
             tag: debian12-386
             nogalera: false
             dockerfile: 'debian.Dockerfile hashicorp.fragment.Dockerfile minio.fragment.Dockerfile'
@@ -81,12 +81,12 @@ jobs:
 
           - image: ubuntu:22.04
             platforms: linux/amd64, linux/arm64/v8, linux/ppc64le, linux/s390x
-            branch: 11.4
+            branch: 10.11
             nogalera: false
 
           - image: ubuntu:24.04
             platforms: linux/amd64, linux/arm64/v8, linux/ppc64le, linux/s390x
-            branch: 11.4
+            branch: 10.11
             nogalera: false
 
           - image: ubuntu:25.04

ci_build_images/debian.Dockerfile

@@ -50,6 +50,10 @@ RUN . /etc/os-release \
     && curl -skO "https://raw.githubusercontent.com/MariaDB/server/$MARIADB_BRANCH/debian/autobake-deb.sh" \
     && chmod a+x autobake-deb.sh \
     && AUTOBAKE_PREP_CONTROL_RULES_ONLY=1 ./autobake-deb.sh \
+    # Hack to force install ARM boost deps on older Debian/Ubuntu,
+    # needed for building and packaging ARM CS 23.10.x for MariaDB Server >= 11.4
+    && sed -Ei '/libboost-/ s/\[amd64\]/[amd64 arm64]/g' debian/control \
+    # --
     && mk-build-deps -r -i debian/control \
     -t 'apt-get -y -o Debug::pkgProblemResolver=yes --no-install-recommends' \
     && apt-get -y build-dep -q mariadb-server \