Add rsvg as a dependency

This is required to add svg support to mat2

archlinux

@@ -3,6 +3,7 @@ FROM archlinux/base
 RUN pacman -Sy --noconfirm \
     ffmpeg \
     gdk-pixbuf2 \
+    librsvg \
     mailcap \
     perl-image-exiftool \
     poppler-glib \

debian

@@ -6,6 +6,7 @@ RUN apt-get update \
     ffmpeg \ 
     gir1.2-gdkpixbuf-2.0 \
     gir1.2-poppler-0.18 \
+		gir1.2-rsvg-2.0 \
     libimage-exiftool-perl \
     python3-bandit \
     python3-gi-cairo \

fedora

@@ -9,6 +9,7 @@ RUN FEDORA_VERSION="$(rpm -E %fedora)" \
 &&  dnf install -y \
     cairo \
     cairo-gobject \
+    librsvg2 \
     ffmpeg \
     gdk-pixbuf2 \
     gdk-pixbuf2-modules \

gentoo

@@ -14,6 +14,7 @@ RUN emerge dev-util/ccache \
 &&  emerge app-text/poppler \
     dev-python/pycairo \
     dev-python/pygobject \
+    gnome-base/librsvg \
     media-libs/exiftool \
     media-libs/mutagen \
     sys-apps/bubblewrap \

linting

@@ -4,6 +4,7 @@ RUN apt-get update \
 &&  apt-get install --no-install-recommends --no-install-suggests --yes \
     gir1.2-gdkpixbuf-2.0 \
     gir1.2-poppler-0.18 \
+		gir1.2-rsvg-2.0 \
     pyflakes3 \
     pylint3 \
     python3-bandit \