feat: add --setup-only flag to entrypoint for init container use

Signed-off-by: danbugs <danilochiarlone@gmail.com>

Author: danbugs

host/pyhl-entrypoint.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -e
 
-if [ ! -d "$PYHL_HOME/snapshot" ]; then
+if [ ! -f "$PYHL_HOME/snapshot/index.json" ]; then
     staging=$(mktemp -d)
     mkdir -p "$staging/.unikraft/build"
     ln -s "$PYHL_HOME/kernel" "$staging/.unikraft/build/driver_hyperlight-x86_64"
@@ -10,4 +10,8 @@ if [ ! -d "$PYHL_HOME/snapshot" ]; then
     rm -rf "$staging"
 fi
 
+if [ "$1" = "--setup-only" ]; then
+    exit 0
+fi
+
 exec pyhl run --dest "$PYHL_HOME" --net "$@"