add missing mysql connector dependencies to docker images (#4160)

.ci/ArchLinux/Dockerfile

@@ -5,6 +5,7 @@ RUN pacman --sync --refresh --sysupgrade --needed --noconfirm \
         ccache \
         cmake \
         git \
+        mariadb-libs \
         protobuf \
         qt5-base \
         qt5-multimedia \

.ci/DebianBuster/Dockerfile

@@ -9,6 +9,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
         g++ \
         git \
         liblzma-dev \
+        libmariadb-dev-compat \
         libprotobuf-dev \
         libqt5multimedia5-plugins \
         libqt5sql5-mysql \

.ci/Fedora32/Dockerfile

@@ -10,6 +10,7 @@ RUN dnf install -y \
         git \
         hicolor-icon-theme \
         libappstream-glib \
+        mariadb-devel \
         protobuf-devel \
         qt5-{qttools,qtsvg,qtmultimedia,qtwebsockets}-devel \
         rpm-build \

.ci/UbuntuBionic/Dockerfile

@@ -9,6 +9,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
         g++ \
         git \
         liblzma-dev \
+        libmariadb-dev-compat \
         libprotobuf-dev \
         libqt5multimedia5-plugins \
         libqt5sql5-mysql \

.ci/UbuntuFocal/Dockerfile

@@ -10,6 +10,7 @@ RUN apt-get update && \
         g++ \
         git \
         liblzma-dev \
+        libmariadb-dev-compat \
         libprotobuf-dev \
         libqt5multimedia5-plugins \
         libqt5sql5-mysql \