apt-publish: publish dummy i386 release, even though we don't make packages for it as Ubuntu on amd64 is sometimes confused and tries downloading i386 anyway (#574)

tools/apt-publish.sh

@@ -15,7 +15,9 @@ if [ ! -d "$PKGDIR" ]; then
 fi
 
 distributions="stable testing unstable"
-architectures="amd64 arm64 armhf"
+
+# note we don't produce packages for i386 but lack of it confuses some amd64 clients.
+architectures="amd64 arm64 armhf i386"
 
 WORK_DIR=/tmp/apt-publish
 rm -rf "$WORK_DIR"
@@ -105,4 +107,4 @@ echo Setting caching parameters...
 gsutil -m setmeta -h "Cache-Control:no-cache, max-age=0" $GS_PREFIX/dists/{stable,testing,unstable}/{Release,Release.gpg,InRelease}
 gsutil -m setmeta -h "Cache-Control:no-cache, max-age=0" $GS_PREFIX/dists/{stable,testing,unstable}/main/binary-{amd64,arm64,armhf}/Packages{,.gz}
 
-echo Done.
+echo Done.