add note to remove branch

Signed-off-by: James Sturtevant <jsturtevant@gmail.com>

Author: jsturtevant

.devcontainer/Dockerfile

@@ -1,2 +1,4 @@
 FROM docker.io/jsturtevant/hl-wasm:latest
+
+# remove this once the branch is merged.
 RUN cargo install --git https://github.com/hyperlight-dev/hyperlight-wasm hyperlight-wasm-aot