Added dockerfile

Dockerfile

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+FROM alpine:edge
+
+RUN apk --no-cache add make g++ musl-dev curl \
+  jemalloc zeromq libevent msgpack-c-dev ca-certificates && \
+  update-ca-certificates
+
+WORKDIR /usr/local/src
+
+ENV CFLAGS -g -O2 -fPIE -fstack-protector-strong -Wformat -Werror=format-security
+ENV LDFLAGS -Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z,relro -Wl,-z,now
+ENV CPPFLAGS -Wdate-time -D_FORTIFY_SOURCE=2
+ENV CXXFLAGS -g -O2 -fPIE -fstack-protector-strong -Wformat -Werror=format-security
+ENV VERSION 6.1.4
+
+RUN curl -Lo groonga.tar.gz \
+  http://packages.groonga.org/source/groonga/groonga-$VERSION.tar.gz && \
+  tar xzf groonga.tar.gz && cd groonga-$VERSION && \
+  ./configure --prefix=/usr \
+    --disable-maintainer-mode --disable-dependency-tracking \
+    --disable-groonga-httpd && \
+  make && make install && make clean && cd .. && rm -rf groonga*
+
+ENTRYPOINT ["groonga"]