update cross compilation settings for github actions

docker/Dockerfile.slim

@@ -0,0 +1,55 @@
+########################################
+FROM --platform=$BUILDPLATFORM messense/rust-musl-cross:${TARGETARCH}-musl AS builder
+
+ARG TARGETARCH
+
+RUN if [ $TARGETARCH = "amd64" ]; then \
+  echo "x86_64" > /arch; \
+  elif [ $TARGETARCH = "arm64" ]; then \
+  echo "aarch64" > /arch; \
+  else \
+  echo "Unsupported platform: $TARGETARCH"; \
+  exit 1; \
+  fi
+
+ENV CFLAGS=-Ofast
+
+WORKDIR /tmp
+
+COPY . /tmp/
+
+ENV RUSTFLAGS "-C link-arg=-s"
+
+RUN echo "Building rpxy from source" && \
+  cargo build --release --target $(cat /arch)-unknown-linux-musl && \
+  musl-strip --strip-all /tmp/target/$(cat /arch)-unknown-linux-musl/release/rpxy && \
+  cp /tmp/target/$(cat /arch)-unknown-linux-musl/release/rpxy /tmp/target/release/rpxy
+
+########################################
+FROM --platform=$TARGETPLATFORM alpine:latest AS runner
+LABEL maintainer="Jun Kurihara"
+
+ENV RUNTIME_DEPS logrotate ca-certificates su-exec
+
+RUN apk add --no-cache ${RUNTIME_DEPS} && \
+  update-ca-certificates && \
+  find / -type d -path /proc -prune -o -type f -perm /u+s -exec chmod u-s {} \; && \
+  find / -type d -path /proc -prune -o -type f -perm /g+s -exec chmod g-s {} \; && \
+  mkdir -p /rpxy/bin &&\
+  mkdir -p /rpxy/log
+
+COPY --from=builder /tmp/target/release/rpxy /rpxy/bin/rpxy
+COPY ./docker/run.sh /rpxy
+COPY ./docker/entrypoint.sh /rpxy
+
+RUN chmod +x /rpxy/run.sh && \
+  chmod +x /rpxy/entrypoint.sh
+
+ENV SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt
+ENV SSL_CERT_DIR=/etc/ssl/certs
+
+EXPOSE 80 443
+
+CMD ["/rpxy/entrypoint.sh"]
+
+ENTRYPOINT ["/rpxy/entrypoint.sh"]