Try #7:

build-env/Dockerfile

@@ -1,21 +1,22 @@
 # Build context: parent directory
-FROM rust:slim-bullseye as create-build-env
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    gcc g++ cmake python3 make
+FROM alpine:edge as create-build-env
+RUN apk add gcc g++ cmake python3 make rust
+RUN apk add cargo
 COPY . /pps
 WORKDIR /pps
 ENV PYTHONUNBUFFERED=1
 RUN python3 ./build-env/make.py --out /build-env
 
-FROM rust:slim as build-pps
+FROM alpine:edge as build-pps
+RUN apk add rust
+RUN apk add cargo
 COPY . /pps
 WORKDIR /pps
 RUN cargo install --path cli
 
-FROM ubuntu:focal
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    gcc g++ cmake python3 make
+FROM alpine:edge
+RUN apk add gcc g++ cmake python3 make
 WORKDIR /usr/local/bin
-COPY --from=build-pps /usr/local/cargo/bin/pps-cli pps-cli
+COPY --from=build-pps /root/.cargo/bin/pps-cli pps-cli
 COPY --from=create-build-env /build-env /opt/pps-build-env
 ENV JJS_PATH=/opt/pps-build-env