bump alpine to 3.9.2 and Dockerfile cosmetics
@@ -12,7 +12,7 @@ COPY . .
RUN cargo build --target=x86_64-unknown-linux-musl --release --locked
# -- stage 2: create alpine-based container with the static routinator executable
-FROM alpine:3.9
+FROM alpine:3.9.2
COPY --from=build /tmp/routinator/target/x86_64-unknown-linux-musl/release/routinator /usr/local/bin/
# Install rsync as routinator depends on it
