Add docker image with ffmpeg6 (#82)

docker/ffmpeg/Dockerfile

@@ -0,0 +1,25 @@
+#All we do is copy the ffmpeg from the base docker image, without any of the created users and groups
+ARG UBUNTU_RELEASE=22.04
+FROM ghcr.io/linuxserver/ffmpeg:amd64-latest as base
+
+FROM ubuntu:${UBUNTU_RELEASE}
+
+ARG DEBIAN_FRONTEND=noninteractive
+
+#
+#Install ffmpeg5
+RUN mkdir -p etc/OpenCL/vendors
+COPY  --from=base /usr/local /usr/local/
+COPY  --from=base /etc/OpenCL/vendors/nvidia.icd /etc/OpenCL/vendors/
+
+RUN apt-get update; \
+    apt-get install -y \
+    libexpat1 libglib2.0-0 libgomp1 libharfbuzz0b libv4l-0 \
+    libwayland-client0 libx11-6 libx11-xcb1 libxcb1 libxcb-dri3-0 \
+    libxcb-shape0 libxcb-xfixes0 libxext6 libxfixes3 libxml2 ocl-icd-libopencl1; \
+    #
+    #clean up
+    rm -rf /var/lib/apt/lists/* /var/tmp/*
+
+#check the installed version
+RUN ffmpeg -version;