jibri: add check for /dev/shm size

If the container was staryed without a /dev/shm of at least 2GB
(defaults to 6MB in Docker) Chrome will behave erratically or crash.

Catch this with a tiny binary and make the container fail to start.

Ref: https://github.com/jitsi/docker-jitsi-meet/issues/1653

jibri/Dockerfile

@@ -20,6 +20,12 @@ RUN apt-dpkg-wrap apt-get update && \
     apt-dpkg-wrap apt-get install -y -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confold" jibri libgl1-mesa-dri procps jitsi-upload-integrations jitsi-autoscaler-sidecar jq pulseaudio dbus dbus-x11 rtkit unzip fonts-noto && \
     /usr/bin/install-chrome.sh && \
     apt-cleanup && \
-    adduser jibri rtkit
+    adduser jibri rtkit && \
+    case ${TARGETPLATFORM} in \
+        "linux/amd64")  SC_ARCH=x86_64  ;; \
+        "linux/arm64")  SC_ARCH=aarch64  ;; \
+    esac && \
+    wget -qO /usr/bin/shm-check https://github.com/saghul/shm-check/releases/download/v1.0.0/shm-check-${SC_ARCH} && \
+    chmod +x /usr/bin/shm-check
 
 VOLUME /config

jibri/rootfs/etc/cont-init.d/10-config

@@ -1,5 +1,11 @@
 #!/usr/bin/with-contenv bash
 
+# Check if /dev/shm is large enough (2GB at least)
+if ! shm-check; then
+    echo "/dev/shm must be at least 2GB in size"
+    exit 1
+fi
+
 if [[ -z $JIBRI_RECORDER_PASSWORD || -z $JIBRI_XMPP_PASSWORD ]]; then
     echo 'FATAL ERROR: Jibri recorder password and auth password must be set'
     exit 1