ci: Add a Dockerfile

This is a simple image based on current Fedora with the required build
dependencies.

Dockerfile

@@ -0,0 +1,32 @@
+FROM fedora:31
+ARG FEDORA_VER=31
+
+LABEL description="Fedora-based environment for building PipeWire" \
+      maintainer="George Kiagiadakis <george.kiagiadakis@collabora.com>"
+
+# Install pipewire dependencies
+RUN dnf -y install \
+    gcc \
+    meson \
+    systemd-devel \
+    dbus-devel \
+    glib-devel \
+    gstreamer1-devel \
+    gstreamer1-plugins-base-devel \
+    jack-audio-connection-kit-devel \
+    pulseaudio-libs-devel \
+    alsa-lib-devel \
+    libv4l-devel \
+    libX11-devel \
+    SDL2-devel \
+    libva-devel \
+    bluez-libs-devel \
+    sbc-devel \
+    doxygen \
+    graphviz \
+    xmltoman \
+    vulkan-loader-devel \
+    git \
+    make \
+    findutils \
+    && dnf clean all