fix(Dockerfile): install luarocks

Dockerfile.deb

@@ -25,7 +25,13 @@ RUN set -ex; \
       && echo "${KONG_SHA256}  /tmp/kong.deb" | sha256sum -c -; \
     fi \
     && apt-get update \
-    && apt-get install --yes /tmp/kong.deb \
+    && apt-get install --yes /tmp/kong.deb lua5.1 liblua5.1-dev unzip make \
+    && curl -L https://luarocks.org/releases/luarocks-3.8.0.tar.gz -o luarocks-3.8.0.tar.gz \
+    && tar zxpf luarocks-3.8.0.tar.gz \
+    && cd luarocks-3.8.0 \
+    && ./configure && make && make install \
+    && export PATH=$PATH:/usr/local/bin/luarocks \
+    && cd - \
     && rm -rf /var/lib/apt/lists/* \
     && rm -rf /tmp/kong.deb \
     && chown kong:0 /usr/local/bin/kong \

ubuntu/Dockerfile

@@ -36,7 +36,7 @@ RUN set -ex; \
     # Please update the ubuntu install docs if the below line is changed so that
     # end users can properly install Kong along with its required dependencies
     # and that our CI does not diverge from our docs.
-    && apt install --yes /tmp/kong.deb \
+    && apt install --yes /tmp/kong.deb luarocks\
     && rm -rf /var/lib/apt/lists/* \
     && rm -rf /tmp/kong.deb \
     && chown kong:0 /usr/local/bin/kong \