fix: make the path from which we copy the libs portable to more archs

Author: dottorblaster

scx_rustland/Dockerfile

@@ -32,9 +32,19 @@ RUN cargo build --release -p scx_rustland
 
 FROM gcr.io/distroless/cc
 
+ARG TARGETPLATFORM
+
+RUN if [ "$TARGETPLATFORM" = "linux/arm64" ]; then \
+      echo "Setting $COPY_LIBS_DIR to aarch64-linux-gnu" && \
+      export COPY_LIBS_DIR="aarch64-linux-gnu"; \
+    else \
+      echo "Setting default COPY_LIBS_DIR x86_64-linux-gnu" && \
+      export COPY_LIBS_DIR="x86_64-linux-gnu"; \
+    fi
+
 COPY --from=builder /scx/target/release/scx_rustland /scx_rustland
-COPY --from=builder /usr/lib/aarch64-linux-gnu/libelf.so.1 /usr/lib/libelf.so.1
-COPY --from=builder /usr/lib/aarch64-linux-gnu/libz.so.1 /usr/lib/libz.so.1
-COPY --from=builder /usr/lib/aarch64-linux-gnu/libseccomp.so.2 /usr/lib/libseccomp.so.2
+COPY --from=builder /usr/lib/$COPY_LIBS_DIR/libelf.so.1 /usr/lib/libelf.so.1
+COPY --from=builder /usr/lib/$COPY_LIBS_DIR/libz.so.1 /usr/lib/libz.so.1
+COPY --from=builder /usr/lib/$COPY_LIBS_DIR/libseccomp.so.2 /usr/lib/libseccomp.so.2
 
 CMD ["/scx_rustland"]