remove rm now that it compiled

Dockerfile

@@ -86,12 +86,8 @@ COPY . .
 # TODO: clean needed because of rust upgrade and jenkins caches :'(
 RUN --mount=type=cache,target=/root/.cargo/git \
     --mount=type=cache,target=/root/.cargo/registry \
-    --mount=type=cache,target=/app/target \
-    --mount=type=cache,target=/app/target_test \
     set -eux -o pipefail; \
     \
-    rm -rf /app/target/*; \
-    rm -rf /app/target_test/*; \
     [ -e "$(pwd)/payment-contracts/src/contracts/mod.rs" ] || touch "$(pwd)/payment-contracts/build.rs"; \
     cargo \
     --locked \