Merge pull request #5 from codewars/reduce-image-size

Dockerfile

@@ -1,29 +1,22 @@
 FROM docker.io/library/ubuntu:22.04
 
 RUN set -ex; \
+    buildDeps='g++ make cmake wget ca-certificates'; \
     apt-get update; \
     apt-get install -y --no-install-recommends \
         gcc \
-        g++ \
-        make \
-        cmake \
-        wget \
-        ca-certificates \
+        $buildDeps \
     ; \
-    apt-get autoremove -y; \
-    apt-get clean; \
-    rm -rf /var/lib/apt/lists/*;
-
-RUN set -ex; \
     cd /tmp; \
+    mkdir -p /tmp/cgreen; \
     wget https://github.com/cgreen-devs/cgreen/archive/refs/tags/1.6.0.tar.gz; \
-    tar xvf 1.6.0.tar.gz; \
-    rm -vf 1.6.0.tar.gz; \
-    cd cgreen-1.6.0; \
-    make; \
-    make install; \
-    cd ..; \
-    rm -rvf /tmp/cgreen-1.6.0;
+    tar -xzf 1.6.0.tar.gz -C /tmp/cgreen --strip-components=1; \
+    rm 1.6.0.tar.gz; \
+    make -C /tmp/cgreen; \
+    make -C /tmp/cgreen install; \
+    apt-get purge -y --auto-remove $buildDeps; \
+    apt-get clean; \
+    rm -rf /var/lib/apt/lists/* /tmp/*;
 
 ENV LD_LIBRARY_PATH=/usr/local/lib