chore: use root user in dockerfile

Dockerfile

@@ -3,19 +3,14 @@ FROM public.ecr.aws/r5b3e0r5/3box/rust-builder:latest as builder
 RUN mkdir -p /home/builder/keramik/
 WORKDIR /home/builder/keramik/
 
-# Use the same ids as the parent docker image by default
-# ARG UID=1001
-# ARG GID=1001
-USER root
-
 # Copy in source code
 COPY . .
 
 # Build application using a docker cache
 # To clear the cache use:
 #   docker builder prune --filter type=exec.cachemount
-RUN --mount=type=cache,target=/home/builder/.cargo,uid=1001,gid=1001 \
-	--mount=type=cache,target=/home/builder/keramik/target,uid=1001,gid=1001 \
+RUN --mount=type=cache,target=/home/builder/.cargo \
+	--mount=type=cache,target=/home/builder/keramik/target \
     make build && \
     cp ./target/release/keramik-runner ./target/release/keramik-operator ./