install oras when as part of uenv installation

activate

@@ -1,5 +1,6 @@
 export UENV_CMD=@@prefix@@/libexec/uenv-impl
 export UENV_VERSION=@@version@@
+export UENV_PREFIX=@@prefix@@
 
 function usage {
     echo "uenv - for using user environments [version @@version@@]"

docs/images.md

@@ -0,0 +1,24 @@
+
+the `image` 
+```
+# list images available locally
+uenv image pull gromacs/2023
+# pull directly from: requires credentials
+uenv image pull --full <https://jfrog...> --name test/2023
+
+# list images available locally
+uenv image find
+# list images available on JFrog
+uenv image avail
+uenv image avail --cluster=eiger
+```
+
+updates to other commands
+```
+# this should return information about the current cluster?
+> uenv status
+no uenv loaded
+on cluster eiger
+```
+
+

install

@@ -94,4 +94,14 @@ echo "installing $prefix/libexec/uenv-impl"
 cp $script_path/uenv-impl $prefix/libexec/uenv-impl
 sed "s|@@version@@|$version|g" -i $prefix/libexec/uenv-impl
 
+# download and install oras client
+echo "installing oras client"
+oras_version=1.1.0
+oras_file=oras_${oras_version}_linux_amd64.tar.gz
+oras_url=https://github.com/oras-project/oras/releases/download/v${oras_version}/${oras_file}
+oras_path=`mktemp -d`
+(cd "$oras_path"; wget --quiet "$oras_url"; tar -xzf $oras_file; rm *.tar.gz)
+cp $oras_path/oras $prefix/libexec/uenv-oras
+rm -rf $oras_path
+
 prompt_bash_update "$prefix" "$always_yes"