docker/alpine: add caliper to alpine image

problem: caliper is missing from the alpine image

solution: add it

src/test/docker/alpine/Dockerfile

@@ -60,3 +60,7 @@ ENV LANG=C.UTF-8
 COPY scripts/fetch-and-build-catch.sh /fetch-and-build-catch.sh
 RUN /fetch-and-build-catch.sh
 
+# Install caliper by hand for now:
+COPY scripts/fetch-and-build-caliper.sh /fetch-and-build-caliper.sh
+RUN /fetch-and-build-caliper.sh
+