Smaller docker image

docker/Dockerfile

-FROM k8s.gcr.io/debian-base-amd64:v2.0.0
+FROM debian:10 as build
 
-RUN /usr/local/bin/clean-install \
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
         git g++ make binutils autoconf automake autotools-dev libtool \
-	pkg-config libev-dev libjemalloc-dev \
-        libev4 libjemalloc1 ca-certificates mime-support && \
+        pkg-config libev-dev libjemalloc-dev \
+        ca-certificates mime-support && \
     git clone --depth 1 -b OpenSSL_1_1_1g-quic-draft-29 https://github.com/tatsuhiro-t/openssl && \
     cd openssl && ./config enable-tls1_3 --openssldir=/etc/ssl && make -j$(nproc) && make install_sw && cd .. && rm -rf openssl && \
     git clone --depth 1 https://github.com/ngtcp2/nghttp3 && \
@@ -12,11 +13,25 @@ RUN /usr/local/bin/clean-install \
     make -j$(nproc) && make install-strip && cd .. && rm -rf nghttp3 && \
     git clone --depth 1 https://github.com/ngtcp2/ngtcp2 && \
     cd ngtcp2 && autoreconf -i && \
-    ./configure && \
-    make -j$(nproc) && make install-strip && cp examples/server examples/client /usr/local/bin && cd .. && rm -rf ngtcp2 && \
-    strip /usr/local/lib/*.so.*.* /usr/local/lib/engines-*/*.so && \
-    rm -rf /usr/local/lib/libssl.so /usr/local/lib/libcrypto.so /usr/local/lib/libssl.a /usr/local/lib/libcrypto.a /usr/local/lib/pkgconfig/*ssl.pc /usr/local/include/openssl/* && \
-    apt-get -y purge git g++ make binutils autoconf automake autotools-dev libtool pkg-config \
-        libev-dev libjemalloc-dev && \
+    ./configure \
+        LIBS="-ldl -pthread" \
+        OPENSSL_LIBS="-l:libssl.a -l:libcrypto.a" \
+        LIBEV_LIBS="-l:libev.a" \
+        JEMALLOC_LIBS="-l:libjemalloc.a" && \
+    make -j$(nproc) LDFLAGS="-static-libtool-libs" && \
+    strip examples/client examples/server && \
+    cp examples/client examples/server /usr/local/bin && \
+    cd .. && rm -rf ngtcp2 && \
+    apt-get -y purge \
+        git g++ make binutils autoconf automake autotools-dev libtool \
+        pkg-config libev-dev libjemalloc-dev \
+        ca-certificates && \
     apt-get -y autoremove --purge && \
     rm -rf /var/log/*
+
+FROM gcr.io/distroless/cc-debian10
+
+COPY --from=build /usr/local/bin/client /usr/local/bin/server /usr/local/bin/
+COPY --from=build /etc/mime.types /etc/
+
+CMD ["/usr/local/bin/client"]