More generic image type for OCI-compliant container technologies (#802)

It's a more generic term and applicable to alternatives of Docker, such
as Podman or other OCI-compliant technologies.

---------

Signed-off-by: Yuan Tang <terrytangyuan@gmail.com>

llama_stack/distribution/configure_container.sh

@@ -6,8 +6,8 @@
 # This source code is licensed under the terms described in the LICENSE file in
 # the root directory of this source tree.
 
-DOCKER_BINARY=${DOCKER_BINARY:-docker}
-DOCKER_OPTS=${DOCKER_OPTS:-}
+CONTAINER_BINARY=${CONTAINER_BINARY:-docker}
+CONTAINER_OPTS=${CONTAINER_OPTS:-}
 LLAMA_STACK_DIR=${LLAMA_STACK_DIR:-}
 
 set -euo pipefail
@@ -24,13 +24,13 @@ if [ $# -lt 2 ]; then
   exit 1
 fi
 
-docker_image="$1"
+container_image="$1"
 host_build_dir="$2"
 container_build_dir="/app/builds"
 
 if command -v selinuxenabled &> /dev/null && selinuxenabled; then
   # Disable SELinux labels
-  DOCKER_OPTS="$DOCKER_OPTS --security-opt label=disable"
+  CONTAINER_OPTS="$CONTAINER_OPTS --security-opt label=disable"
 fi
 
 mounts=""
@@ -39,9 +39,9 @@ if [ -n "$LLAMA_STACK_DIR" ]; then
 fi
 
 set -x
-$DOCKER_BINARY run $DOCKER_OPTS -it \
+$CONTAINER_BINARY run $CONTAINER_OPTS -it \
   --entrypoint "/usr/local/bin/llama" \
   -v $host_build_dir:$container_build_dir \
   $mounts \
-  $docker_image \
+  $container_image \
   stack configure ./llamastack-build.yaml --output-dir $container_build_dir