replace use of docker registry docker.io (hub.docker.com) with self-hosted r.xmox.nl

when setting up the docker organization account for mox it already felt off.
depending on such a party to serve binaries didn't feel great to begin with.
after clarifying online discussions of docker's vague announcement of removing
free team organizations it was clearly time to move off hub.docker.com.  best to
self-host.

r.xmox.nl is hosted with the new github.com/mjl-/vex.

pinging issue #3

README.md

@@ -60,12 +60,11 @@ Verify you have a working mox binary:
 
 Note: Mox only compiles for/works on unix systems, not on Plan 9 or Windows.
 
-You can also run mox with docker image "docker.io/moxmail/mox", with tags like
-"latest", "0.0.1" and "0.0.1-go1.20.1-alpine3.17.2", see
-https://hub.docker.com/r/moxmail/mox.  See docker-compose.yml in this
-repository for instructions on starting. You must run docker with host
-networking, because mox needs to find your actual public IP's and get the
-remote IPs for incoming connections, not a local/internal NAT IP.
+You can also run mox with docker image `r.xmox.nl/mox`, with tags like `v0.0.1`
+and `v0.0.1-go1.20.1-alpine3.17.2`, see https://r.xmox.nl/repo/mox/.  See
+docker-compose.yml in this repository for instructions on starting. You must run
+docker with host networking, because mox needs to find your actual public IP's
+and get the remote IPs for incoming connections, not a local/internal NAT IP.
 
 
 # Quickstart

docker-compose.yml

@@ -14,8 +14,9 @@
 version: '3.7'
 services:
   mox:
-    # Replace latest with the version you want to run.
-    image: docker.io/moxmail/mox:latest
+    # Replace "latest" with the version you want to run, see https://r.xmox.nl/repo/mox/.
+    # Include the @sha256:... digest to ensure you get the listed image.
+    image: r.xmox.nl/mox:latest
     environment:
       - MOX_DOCKER=yes # Quickstart won't try to write systemd service file.
     # Mox needs host networking because it needs access to the IPs of the

docker-release.sh

@@ -36,19 +36,20 @@ echo Building with $goversion and $alpineversion
 # needed because the platform in "FROM --platform <image>" in the first stage
 # seems to override the TARGET* variables.
 test -d empty || mkdir empty
-(podman manifest rm moxmail/mox:$moxversion-$goversion-$alpineversion || exit 0)
+((rm -r tmp/gomod || exit 0); mkdir -p tmp/gomod) # fetch modules through goproxy just once
+(podman manifest rm mox:$moxversion-$goversion-$alpineversion || exit 0)
 for platform in $(echo $platforms | sed 's/,/ /g'); do
 	goos=$(echo $platform | sed 's,/.*$,,')
 	goarch=$(echo $platform | sed 's,^.*/,,')
-	podman build --platform $platform -f Dockerfile.release -v $HOME/go/pkg/sumdb:/go/pkg/sumbd:ro --build-arg goos=$goos --build-arg goarch=$goarch --build-arg moxversion=$moxversion --manifest moxmail/mox:$moxversion-$goversion-$alpineversion empty
+	podman build --platform $platform -f Dockerfile.release -v $HOME/go/pkg/sumdb:/go/pkg/sumbd:ro -v $PWD/tmp/gomod:/go/pkg/mod --build-arg goos=$goos --build-arg goarch=$goarch --build-arg moxversion=$moxversion --manifest mox:$moxversion-$goversion-$alpineversion empty
 done
 
 cat <<EOF
 
 # Suggested commands to push images:
 
-podman manifest push --all moxmail/mox:$moxversion-$goversion-$alpineversion docker.io/moxmail/mox:$moxversion-$goversion-$alpineversion
+podman manifest push --all mox:$moxversion-$goversion-$alpineversion \$host/mox:$moxversion-$goversion-$alpineversion
 
-podman manifest push --all moxmail/mox:$moxversion-$goversion-$alpineversion docker.io/moxmail/mox:$moxversion
-podman manifest push --all moxmail/mox:$moxversion-$goversion-$alpineversion docker.io/moxmail/mox:latest
+podman manifest push --all mox:$moxversion-$goversion-$alpineversion \$host/mox:$moxversion
+podman manifest push --all mox:$moxversion-$goversion-$alpineversion \$host/mox:latest
 EOF