Compile bbpPairings with alpine image

for compatibility when running the exe from the lila container

fixes #132

docker/bbpPairings.Dockerfile

@@ -1,10 +1,5 @@
-FROM ubuntu:focal
+FROM sbtscala/scala-sbt:eclipse-temurin-alpine-21.0.2_13_1.10.4_3.5.2
 
-RUN apt-get update && \
-    apt-get install --yes \
-        g++ \
-        git \
-        make \
-    && apt-get clean
+RUN apk add build-base
 
 WORKDIR /mnt

lila-docker

@@ -139,7 +139,8 @@ setup_bbppairings() {
     docker run --rm -v ./repos/bbpPairings:/mnt bbppairings make
 
     ## verify it compiled
-    ./repos/bbpPairings/bbpPairings.exe
+    docker compose run --rm --entrypoint="/opt/bbpPairings/bbpPairings.exe" lila \
+        && echo "✅ bbppairings compiled successfully"
 }
 
 reset_database() {