ci: Use a docker image for builds and tests

Avoid repeating the machine updates and deps installation at every stage,
just reuse the docker image

Registered images are at:
  https://gitlab.freedesktop.org/libfprint/libfprint/container_registry

.gitlab-ci/Dockerfile

@@ -0,0 +1,36 @@
+# Rebuild and push with
+#
+#  cd .gitlab-ci/
+#  docker build --no-cache -t registry.freedesktop.org/libfprint/libfprint/master:v1 .
+#  docker push registry.freedesktop.org/libfprint/libfprint/master:v1
+#
+
+FROM fedora:rawhide
+
+RUN dnf -y update && dnf -y upgrade && \
+  dnf -y install \
+         doxygen \
+         flatpak-builder \
+         gcc \
+         gcc-c++ \
+         git \
+         glib2-devel \
+         glibc-devel \
+         gobject-introspection-devel \
+         gtk-doc \
+         gtk3-devel \
+         libabigail \
+         libgusb-devel \
+         libX11-devel \
+         libXv-devel \
+         meson \
+         nss-devel \
+         pixman-devel \
+         python3-cairo \
+         python3-gobject \
+         systemd \
+         umockdev \
+         uncrustify \
+         valgrind \
+  && \
+  dnf clean all