feat(librdkafka): Create image alpine-based (#69)

librdkafka/Dockerfile

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+FROM alpine:3.9
+
+ENV LIBRESSL_VERSION=2.7
+ENV LIBRDKAFKA_VERSION=1.0.0
+
+RUN apk add --no-cache bash curl git openssh openssl yajl-dev zlib-dev cyrus-sasl-dev openssl-dev build-base coreutils && \
+  apk add libressl${LIBRESSL_VERSION}-libcrypto libressl${LIBRESSL_VERSION}-libssl --update-cache --repository http://nl.alpinelinux.org/alpine/edge/main
+
+RUN curl -Lk -o /root/librdkafka-${LIBRDKAFKA_VERSION}.tar.gz https://github.com/edenhill/librdkafka/archive/v${LIBRDKAFKA_VERSION}.tar.gz && \
+      tar -xzf /root/librdkafka-${LIBRDKAFKA_VERSION}.tar.gz -C /root && \
+      cd /root/librdkafka-${LIBRDKAFKA_VERSION} && \
+      ./configure --prefix /usr && make && make install && make clean && ./configure --clean

librdkafka/README.md

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+# librdkafka in alpine
+
+We use this image in multistage build to copy `librdkafka` to our final images.
+
+# Tags
+
+The tag is composed of the flavor of linux we used to build and the version of `librdkafka` e.g. `jobteaser/librdkafka:alpine-v1.0.0`.
+
+# Example
+
+```
+FROM jobteaser/librdkafka:alpine-v1.0.0 as librdkafka
+FROM golang:1.12
+
+# ...
+
+COPY --from=librdkafka /usr/include /usr/include
+COPY --from=librdkafka /usr/lib /usr/lib
+
+# ...
+
+RUN make build
+```