Minor edits

Dockerfile.example

@@ -112,7 +112,7 @@ Pin-Priority: -1" > /etc/apt/preferences.d/firefox-nosnap && \
     update-alternatives --set x-www-browser /usr/bin/firefox
 
 # Install Ubuntu 22.04 specific packages
-RUN if [ "${UBUNTU_RELEASE}" = "22.04" ]; then apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y xcvt; fi && \
+RUN if [ "${UBUNTU_RELEASE}"\> "20.04" ]; then apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y xcvt; fi && \
     rm -rf /var/lib/apt/lists/*
 
 # Add Tini init script - take care of runaway processes

README.md

@@ -38,10 +38,10 @@ Example Google Compute Engine/Google Kubernetes Engine deployment configurations
 
 An example image [`ghcr.io/selkies-project/selkies-gstreamer/gst-py-example`](https://github.com/selkies-project/selkies-gstreamer/pkgs/container/selkies-gstreamer%2Fgst-py-example) from the base [example Dockerfile](./Dockerfile.example) is available.
 
-Run the Docker container built from the [`Dockerfile.example`](./Dockerfile.example), then connect to port **8080** of your Docker host to access the web interface (**replace `main` to `latest` for the release build instead of the development build, and choose the Ubuntu versions `20.04`, or `22.04`**):
+Run the Docker container built from the [`Dockerfile.example`](./Dockerfile.example), then connect to port **8080** of your Docker host to access the web interface (**change `UBUNTU_RELEASE` to `20.04` or `22.04`, then replace `main` to `latest` for the release build instead of the development build**):
 
 ```bash
-docker run --pull=always --name selkies -it --rm -p 8080:8080 -p 3478:3478 ghcr.io/selkies-project/selkies-gstreamer/gst-py-example:main-ubuntu20.04
+docker run --pull=always --name selkies -it --rm -p 8080:8080 -p 3478:3478 ghcr.io/selkies-project/selkies-gstreamer/gst-py-example:main-ubuntu${UBUNTU_RELEASE}
 ```
 
 Repositories [`selkies-vdi`](https://github.com/selkies-project/selkies-vdi) or [`selkies-examples`](https://github.com/selkies-project/selkies-examples) from the [Selkies Project](https://github.com/selkies-project) provide containerized virtual desktop infrastructure (VDI) templates.

infra/gke/manifests/selkies-gstreamer/selkies-gstreamer-statefulset.yaml

@@ -26,7 +26,7 @@ spec:
         # selkies-gstreamer selkies-gstreamer container
         ###
         - name: selkies-gstreamer
-          image: ghcr.io/selkies-project/selkies-gstreamer/gst-py-example:latest-ubuntu20.04
+          image: ghcr.io/selkies-project/selkies-gstreamer/gst-py-example:latest-ubuntu22.04
           imagePullPolicy: Always
           env:
             - name: COTURN_WEB_URI