readme: update instructions [skip ci]

README.md

@@ -25,7 +25,9 @@
 ### How to try this out
 
 with [`podman`](https://podman.io/) and [`just`](https://github.com/casey/just)
-installed, run the following:
+installed, run the following, only supplanting the `mt-pcmt:<tag>` with either
+`testbuild` or one of the [recent tagged
+releases](https://git.dotya.ml/mirre-mt/pcmt/releases):
 ```sh
 # build the image locally using kaniko.
 just kaniko
@@ -38,7 +40,7 @@ just dbstart
 # instead uses the embedded resources.
 podman run --rm -it -e PCMT_DBTYPE=postgres \
     -e PCMT_CONNSTRING="host=127.0.0.1 port=5432 sslmode=disable dbname=postgres password=postgres"
-    -e PCMT_LIVE=False docker.io/immawanderer/pcmt:testbuild \
+    -e PCMT_LIVE=False docker.io/immawanderer/mt-pcmt:<tag> \
     -config /etc/pcmt/config.dhall
 ```
 
@@ -69,7 +71,7 @@ podman run --pod pcmt --replace --name pcmt-og -d --rm \
     -e PCMT_DBTYPE="postgres" \
     -e PCMT_CONNSTRING="host=pcmt-pg port=5432 sslmode=disable user=postgres dbname=postgres password=postgres" \
     -v $PWD/config.dhall:/config.dhall:ro \
-    docker.io/immawanderer/pcmt:testbuild -config /config.dhall
+    docker.io/immawanderer/mt-pcmt:<tag> -config /config.dhall
 
 # also, if we try to connect to the db from the host we get an error (unless
 # there is another database running on localhost already, such as the one from