create: Ignore first argument if it is "no-entrypoint"

src/commands/create/custom_opts.rs

@@ -67,14 +67,20 @@ pub struct CustomOptions {
 
 impl CustomOptions {
     pub fn from_spec(spec: &oci_spec::runtime::Spec, env: RuntimeEnv) -> Result<Self> {
-        let args = spec
+        let mut args: Vec<&String> = spec
             .process()
             .as_ref()
             .unwrap()
             .args()
             .iter()
             .flatten()
-            .filter(|arg| !arg.trim().is_empty());
+            .collect();
+
+        if let Some(&first_arg) = args.first() {
+            if first_arg.trim().is_empty() || first_arg == "no-entrypoint" {
+                args.remove(0);
+            }
+        }
 
         // TODO: We currently assume that no entrypoint is given (either by being set by in the
         // container image or through --entrypoint). Must somehow find whether the first arg is the

tests/env.sh

@@ -237,8 +237,7 @@ start)
         --rm -dit \
         -v "$temp_dir":/home/fedora/images:z \
         -v "$repo_root/target":/home/fedora/target:z \
-        "$env_image" \
-        ""
+        "$env_image"
 
     # shellcheck disable=SC2317
     __extra_cleanup() {

util/package-vm-image.sh

@@ -18,4 +18,5 @@ image_path_in_container=/disk/$( basename "${vm_image_file}" )
 podman image build --file=- --tag="${container_image_tag}" / <<EOF
 FROM scratch
 COPY ${abs_vm_image_file@Q} ${image_path_in_container@Q}
+ENTRYPOINT ["no-entrypoint"]
 EOF