Merge pull request #369 from daliborfilus/fix-crystal-1.8-pcre2-docker-build

Update Dockerfile for Crystal 1.8 + check if binary works

Dockerfile

@@ -6,8 +6,9 @@ COPY . /ameba/
 RUN make clean && make
 
 FROM alpine:latest
-RUN apk add --update yaml pcre gc libevent libgcc
+RUN apk add --update yaml pcre2 gc libevent libgcc
 RUN mkdir /src
 WORKDIR /src
 COPY --from=builder /ameba/bin/ameba /usr/bin/
+RUN ameba -v
 ENTRYPOINT [ "/usr/bin/ameba" ]