universal-docker-in-docker add/update workflows, add qemu

root/etc/s6-overlay/s6-rc.d/init-mod-universal-docker-in-docker-qemu/run

@@ -0,0 +1,6 @@
+#!/usr/bin/with-contenv bash
+
+if [[ $(uname -m) = "x86_64" ]]; then
+    echo "**** Enabling QEMU ****"
+    exec docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+fi

root/etc/s6-overlay/s6-rc.d/init-mod-universal-docker-in-docker-qemu/type

@@ -0,0 +1 @@
+oneshot

root/etc/s6-overlay/s6-rc.d/init-mod-universal-docker-in-docker-qemu/up

@@ -0,0 +1 @@
+/etc/s6-overlay/s6-rc.d/init-mod-universal-docker-in-docker-qemu/run

root/etc/s6-overlay/s6-rc.d/svc-mod-universal-docker-in-docker/notification-fd

@@ -0,0 +1 @@
+10736

root/etc/s6-overlay/s6-rc.d/svc-mod-universal-docker-in-docker/run

@@ -23,5 +23,7 @@ if [ -f /sys/fs/cgroup/cgroup.controllers ]; then
         > /sys/fs/cgroup/cgroup.subtree_control
 fi
 
-exec 2>&1 /usr/local/bin/dockerd \
-    --data-root "/config/var/lib/docker"
+exec \
+    s6-notifyoncheck -d -n 300 -w 1000 -c "docker version" \
+        2>&1 /usr/local/bin/dockerd \
+            --data-root "/config/var/lib/docker"